Infosys HR Manager Interview Questions and Answers

Infosys Technical Interview Questions for Freshers play a crucial role in the recruitment process for candidates aspiring to build a career in one of India’s leading IT services companies. Infosys interviews are designed to evaluate freshers on core technical knowledge, programming fundamentals, problem-solving ability, and understanding of computer science concepts such as data structures, algorithms, object-oriented programming, database management systems, operating systems, and basic networking. Fresh graduates from engineering and computer science backgrounds are often asked questions ranging from simple coding problems to logical reasoning tasks, as well as scenario-based questions that test analytical thinking and real-time application of concepts. In addition to technical skills, Infosys also focuses on assessing communication skills, clarity of thought, and the ability to explain solutions in a structured manner. Candidates may face multiple rounds including online aptitude tests, technical interviews, and HR discussions, where each stage progressively evaluates both knowledge and personality fit. Preparing for Infosys technical interviews requires consistent practice of coding problems, revising core subjects thoroughly, and gaining hands-on experience with programming languages such as Java, Python, or C++. Freshers are also encouraged to practice mock interviews and review commonly asked questions to build confidence and improve performance under pressure. This comprehensive preparation helps candidates understand the interview pattern better, improve their problem-solving speed, and increase their chances of successfully clearing the Infosys recruitment process and securing a strong entry-level position in the IT industry.

1. What is programming language?

Ans:

A programming language is a formal medium used to communicate instructions to computer systems clearly. It allows developers to create software, websites, mobile applications, and automation solutions efficiently. Popular programming languages include C, Java, Python, and JavaScript across industries. Each language provides specific syntax, logic structures, and development advantages for tasks. Programming basics are essential for fresher technical interviews.

2. How to prepare programming language basics?

Ans:

• Learning definitions, purpose, and categories of programming languages builds a strong technical foundation quickly.
• Understanding compiled and interpreted language differences improves interview clarity significantly during discussions.
• Studying popular languages used in companies adds practical relevance effectively.
• Practicing syntax examples helps stronger confidence in fresher rounds naturally.

3. What is algorithm?

Ans:

An algorithm is a step-by-step procedure used to solve a problem logically. It helps convert business or technical requirements into structured computational solutions effectively. Algorithms are important for searching, sorting, calculations, and automation tasks. Good algorithms improve speed, accuracy, and efficiency of software systems significantly. Algorithm basics are highly common in technical interviews.

4. How to prepare algorithm concepts clearly?

Ans:

• Learning that algorithms are structured steps for solving problems creates immediate clarity strongly.
• Studying real examples such as sorting and searching improves practical understanding significantly.
• Understanding efficiency importance adds technical maturity effectively during interviews.
• Practicing pseudocode explanations builds stronger communication naturally.

5. What is flowchart?

Ans:

A flowchart is a graphical representation of logic using symbols and directional arrows. It visually explains processes, decisions, loops, and sequence of operations clearly. Flowcharts help beginners understand program logic before writing code efficiently. They are useful in planning, debugging, and communicating workflows across teams. Flowchart basics may appear in fresher interviews.

6. How to prepare flowchart topics properly?

Ans:

• Learning symbols for start, process, decision, and input-output builds clarity quickly.
• Practicing simple number or login flowcharts improves logic understanding significantly.
• Understanding visual planning benefits adds practical relevance effectively.
• Revising examples helps fresher interview readiness naturally.

7. What is data structure?

Ans:

A data structure is a method of organizing data for efficient access and modification. Common examples include arrays, linked lists, stacks, queues, trees, and graphs. Choosing the right structure improves performance and memory utilization significantly. Data structures are fundamental for writing scalable and optimized applications. This topic is extremely common in technical interviews.

8. How to prepare data structure basics?

Ans:

• Learning purpose and importance of organized data storage creates strong foundations quickly.
• Understanding array, stack, queue, and linked list differences improves clarity significantly.
• Studying practical use cases adds interview relevance effectively.
• Practicing definitions and comparisons strengthens confidence naturally.

9. What is array?

Ans:

An array is a collection of similar elements stored in contiguous memory locations. It allows indexed access, making retrieval operations fast and efficient. Arrays are commonly used for lists, matrices, and temporary storage tasks. Size may be fixed in many programming languages depending on implementation. Arrays are among the first concepts asked in interviews.

10. How to prepare array concepts clearly?

Ans:

• Learning indexed storage and contiguous memory meaning builds immediate understanding strongly.
• Studying traversal, insertion, and deletion basics improves technical readiness significantly.
• Using real examples like marks lists adds practical clarity effectively.
• Comparing arrays with linked lists improves conceptual depth naturally.

11. What is linked list?

Ans:

A linked list is a linear data structure made of connected nodes. Each node stores data along with reference to the next node. It supports dynamic memory usage and flexible insertion operations efficiently. Traversal is sequential because indexed random access is unavailable directly. Linked lists are common beginner interview topics.

12. How to prepare linked list basics?

Ans:

• Understanding node structure with data and pointer builds conceptual clarity quickly.
• Comparing linked lists with arrays improves technical maturity significantly.
• Studying insertion and deletion advantages adds practical value effectively.
• Revising singly and doubly linked types strengthens preparation naturally.

13. What is stack?

Ans:

A stack is a linear data structure following Last In First Out principle. Insertion and deletion occur from one end called the top position. Typical operations include push, pop, peek, and isEmpty methods. Stacks are used in recursion, undo actions, and expression evaluation systems. Stack concepts are common in fresher interviews.

14. How to prepare stack concepts properly?

Ans:

• Learning LIFO behavior with book pile examples creates strong understanding quickly.
• Practicing push and pop operations improves technical clarity significantly.
• Studying applications like browser history adds practical relevance effectively.
• Comparing stack with queue strengthens memory naturally.

15. What is queue?

Ans:

A queue is a linear data structure following First In First Out principle. Insertion happens at rear side while deletion happens from front side. Queues are useful in scheduling, buffering, and printer management systems. Common operations include enqueue, dequeue, and front element retrieval. Queue is a standard fresher interview concept.

16. How to prepare queue basics clearly?

Ans:

• Learning FIFO behavior with ticket line examples creates immediate clarity strongly.
• Understanding enqueue and dequeue operations improves technical readiness significantly.
• Studying circular queue concepts adds extra interview value effectively.
• Comparing stack versus queue improves conceptual confidence naturally.

17. What is database?

Ans:

A database is an organized collection of data stored electronically for access. It allows insertion, retrieval, updating, and deletion of records efficiently. Databases are used in banking, healthcare, retail, and enterprise systems. Examples include MySQL, Oracle, PostgreSQL, and MongoDB platforms widely. Database basics are highly important for freshers.

18. How to prepare database fundamentals?

Ans:

• Learning purpose of organized data storage builds strong conceptual understanding quickly.
• Understanding tables, rows, columns, and keys improves interview clarity significantly.
• Studying relational versus NoSQL systems adds practical depth effectively.
• Revising DBMS terminology strengthens confidence naturally.

19. What is DBMS?

Ans:

DBMS stands for Database Management System used to manage structured data efficiently. It provides tools for storage, retrieval, security, and integrity management operations. DBMS reduces redundancy and supports multiple users safely in organizations. Examples include MySQL, Oracle, SQL Server, and PostgreSQL systems. DBMS is a frequent technical interview topic.

20. How to prepare DBMS topics properly?

Ans:

• Learning core functions like storage and retrieval creates immediate clarity strongly.
• Understanding normalization and keys improves technical maturity significantly.
• Studying transaction control concepts adds practical value effectively.
• Revising common interview definitions builds confidence naturally.

21. What is primary key?

Ans:

A primary key is a column used to uniquely identify each table row. It prevents duplicate records and maintains entity integrity effectively. Primary keys usually contain unique and non-null values only. Examples include employee ID, student ID, or order number fields. Primary key concepts are common in fresher interviews.

22. How to prepare key concepts in databases?

Ans:

• Learning primary, foreign, candidate, and composite key differences builds clarity quickly.
• Using table examples improves practical understanding significantly during interviews.
• Understanding uniqueness importance adds technical maturity effectively.
• Revising relationships between keys strengthens memory naturally.

23. What is SQL?

Ans:

SQL stands for Structured Query Language used to interact with relational databases. It supports creating tables and performing insert, update, delete, and select operations. SQL is widely used in enterprise applications and reporting systems globally. Good SQL knowledge helps manage business data effectively and accurately. SQL basics are essential in technical interviews.

24. How to prepare SQL basics clearly?

Ans:

• Learning SELECT, INSERT, UPDATE, and DELETE statements builds strong readiness quickly.
• Understanding WHERE, ORDER BY, and GROUP BY improves clarity significantly.
• Practicing simple queries adds practical interview confidence effectively.
• Revising joins and aggregate functions strengthens preparation naturally.

25. What are final tips for first stage Infosys technical preparation?

Ans:

Strong basics in programming, data structures, databases, and SQL create excellent foundations. Simple explanations with confidence often perform better than memorized complex answers. Regular practice with examples improves technical communication significantly in interviews. Revision helps retain definitions, comparisons, and common operations effectively. Consistent preparation gives better fresher selection chances.

26. What is join in SQL?

Ans:

A join in SQL is used to combine data from two or more related tables. It connects records using common columns such as keys or matching identifiers. Joins help retrieve meaningful business information stored across separate tables efficiently. Common types include inner join, left join, right join, and full join. Join concepts are frequently asked in technical interviews.

27. How to prepare SQL join concepts clearly?

Ans:

• Learning why data is split into multiple tables creates strong conceptual understanding quickly.
• Studying inner, left, right, and full joins improves technical clarity significantly.
• Practicing employee and department examples adds practical interview relevance effectively.
• Revising syntax regularly builds stronger SQL confidence naturally.

28. What is normalization in DBMS?

Ans:

Normalization is the process of organizing database tables to reduce redundancy. It divides large tables into smaller related tables using proper relationships. This improves consistency, integrity, and maintainability of stored business data significantly. Common levels include first, second, and third normal forms. Normalization is a standard fresher interview topic.

29. How to prepare normalization basics properly?

Ans:

• Learning redundancy meaning and duplicate data issues creates immediate clarity strongly.
• Understanding 1NF, 2NF, and 3NF improves technical readiness significantly.
• Using student records examples adds practical value effectively.
• Comparing normalized versus unnormalized tables strengthens memory naturally.

30. What is operating system?

Ans:

An operating system is system software that manages hardware and software resources. It acts as an interface between users, applications, and computer hardware efficiently. Examples include Windows, Linux, macOS, Android, and other platforms. The operating system handles memory, files, processes, and device management tasks. OS basics are common in technical interviews.

31. How to prepare operating system concepts clearly?

Ans:

• Learning major functions of operating systems builds strong fundamentals quickly.
• Understanding memory, process, and file management improves technical clarity significantly.
• Studying examples like Windows and Linux adds practical relevance effectively.
• Revising common OS terminology strengthens interview confidence naturally.

32. What is process in operating system?

Ans:

A process is a program that is currently executing in memory. It contains code, data, resources, and execution state information together. Multiple processes may run simultaneously using CPU scheduling techniques efficiently. Each process usually has a unique identifier managed by the system. Process basics are frequently asked in interviews.

33. How to prepare process concepts properly?

Ans:

• Understanding difference between program and process creates immediate clarity strongly.
• Learning process states like ready and running improves technical maturity significantly.
• Studying scheduling basics adds practical relevance effectively.
• Revising examples from task manager improves memory naturally.

34. What is thread in operating system?

Ans:

A thread is the smallest unit of execution within a process environment. Multiple threads inside one process can perform tasks concurrently efficiently. Threads share process resources while executing separate instruction flows. They improve responsiveness and performance in many software applications significantly. Thread concepts are common technical interview topics.

35. How to prepare thread versus process difference?

Ans:

• Learning that threads exist inside processes creates strong conceptual clarity quickly.
• Understanding shared resources in threads improves technical depth significantly.
• Comparing memory overhead between process and thread adds interview value effectively.
• Using browser tab examples strengthens memory naturally.

36. What is CPU scheduling?

Ans:

CPU scheduling is the method used to allocate processor time among processes. It ensures efficient execution and fair usage of computing resources. Common algorithms include FCFS, Round Robin, Priority, and SJF methods. Scheduling directly impacts response time and system performance significantly. CPU scheduling is a frequent interview topic.

37. How to prepare scheduling algorithms clearly?

Ans:

• Learning purpose of sharing CPU time builds immediate conceptual understanding strongly.
• Studying FCFS, SJF, Priority, and Round Robin improves readiness significantly.
• Comparing waiting time and turnaround time adds practical depth effectively.
• Practicing examples strengthens interview confidence naturally.

38. What is deadlock in operating system?

Ans:

Deadlock is a condition where processes wait indefinitely for each other’s resources. No process can continue execution because dependencies block progress completely. It often occurs when limited resources are requested in conflicting order. Prevention and avoidance methods are used in system design carefully. Deadlock is commonly asked in interviews.

39. How to prepare deadlock concepts properly?

Ans:

• Learning mutual waiting situations creates strong deadlock understanding quickly.
• Understanding four necessary conditions improves technical clarity significantly.
• Studying prevention and avoidance strategies adds practical relevance effectively.
• Using resource lock examples improves memory naturally.

40. What is computer network?

Ans:

A computer network is a group of connected devices sharing data and resources. Networks allow communication between systems using wired or wireless technologies. Examples include LAN, WAN, MAN, and the global internet network. Networking supports file sharing, printing, messaging, and online services efficiently. Network basics are important for freshers.

41. How to prepare networking basics clearly?

Ans:

• Learning why devices connect for communication builds conceptual strength quickly.
• Understanding LAN, WAN, and internet differences improves clarity significantly.
• Studying routers, switches, and cables adds practical relevance effectively.
• Revising common protocols strengthens confidence naturally.

42. What is IP address?

Ans:

An IP address is a unique numeric identifier assigned to network devices. It helps locate and communicate with systems across networks accurately. Two major versions are IPv4 and IPv6 used worldwide today. IP addresses are essential for routing internet traffic efficiently. This concept is common in technical interviews.

43. How to prepare IP addressing topics properly?

Ans:

• Learning device identification purpose creates immediate clarity strongly.
• Understanding IPv4 and IPv6 differences improves technical readiness significantly.
• Studying public and private IP concepts adds practical value effectively.
• Revising examples strengthens memory naturally.

44. What is HTTP?

Ans:

HTTP stands for HyperText Transfer Protocol used for web communication. It enables browsers and servers to exchange requests and responses efficiently. Methods such as GET and POST are commonly used widely. HTTP forms the foundation of modern website data exchange systems. HTTP basics are common fresher interview topics.

45. How to prepare HTTP concepts clearly?

Ans:

• Learning request-response communication creates strong web fundamentals quickly.
• Understanding GET, POST, PUT, and DELETE improves technical clarity significantly.
• Studying browser-server examples adds practical relevance effectively.
• Revising status codes strengthens interview confidence naturally.

46. What is HTTPS?

Ans:

HTTPS is the secure version of HTTP used for protected communication. It uses SSL or TLS encryption to secure transferred information. Sensitive data like passwords and payment details remain protected online. Most modern websites use HTTPS for trust and safety standards. HTTPS is frequently asked in interviews.

47. How to prepare HTTP and HTTPS difference?

Ans:

• Learning encryption purpose creates immediate clarity strongly for interviews.
• Understanding secure certificates improves technical maturity significantly.
• Comparing normal HTTP with protected HTTPS adds practical value effectively.
• Using banking website examples strengthens memory naturally.

48. What is DNS?

Ans:

DNS stands for Domain Name System used to translate domain names. It converts readable website names into machine-readable IP addresses efficiently. This allows users to access websites without remembering numeric values. DNS plays a major role in internet usability and routing systems. DNS basics are common technical interview questions.

49. How to prepare DNS concepts properly?

Ans:

• Learning name-to-IP translation creates strong conceptual clarity quickly.
• Understanding why domains are easier than numbers improves relevance significantly.
• Studying lookup process adds practical technical depth effectively.
• Revising examples strengthens fresher confidence naturally.

50. What are final tips for second stage Infosys technical preparation?

Ans:

Strong understanding of SQL, operating systems, and networking improves interview readiness greatly. Candidates should explain concepts in simple structured language confidently. Comparisons between related topics often create better technical impressions significantly. Regular revision of definitions and examples improves retention effectively. Consistent preparation increases fresher success chances strongly.

51. What is software testing?

Ans:

Software testing is the process of verifying whether an application works as expected correctly. It helps identify defects, missing requirements, and performance issues before release. Testing improves reliability, usability, and overall customer satisfaction significantly. Both manual and automated approaches are used in projects widely. Testing basics are common in fresher technical interviews.

52. How to prepare software testing basics clearly?

Ans:

• Learning purpose of defect detection and quality assurance builds strong understanding quickly.
• Understanding manual and automation testing differences improves technical clarity significantly.
• Studying real examples like login page testing adds practical relevance effectively.
• Revising common testing terms strengthens interview confidence naturally.

53. What is unit testing?

Ans:

Unit testing checks individual components or functions of software separately. It ensures each small module performs expected logic correctly and consistently. Developers often write unit tests during coding for early bug detection. This practice improves maintainability and reduces debugging effort significantly. Unit testing is frequently asked in interviews.

54. How to prepare unit testing concepts properly?

Ans:

• Learning component-level testing creates immediate conceptual clarity strongly.
• Understanding early bug detection benefits improves technical maturity significantly.
• Studying examples such as calculator function tests adds relevance effectively.
• Revising testing frameworks strengthens fresher readiness naturally.

55. What is integration testing?

Ans:

Integration testing verifies whether combined modules work correctly together after connection. It focuses on data flow and interaction between multiple software components. This testing helps identify interface issues missed during unit testing. Proper integration testing improves end-to-end system reliability significantly. Integration testing is a common interview topic.

56. How to prepare integration testing basics?

Ans:

• Learning module interaction purpose builds strong conceptual understanding quickly.
• Understanding API and database connection checks improves technical clarity significantly.
• Studying top-down and bottom-up methods adds practical depth effectively.
• Comparing with unit testing strengthens memory naturally.

57. What is system testing?

Ans:

System testing evaluates the complete integrated application as one full system. It checks whether functional and non-functional requirements are satisfied properly. This phase is performed after integration testing is completed successfully. System testing ensures readiness before user acceptance or deployment stages. System testing is frequently asked in fresher rounds.

58. How to prepare system testing topics clearly?

Ans:

• Learning complete application validation purpose creates immediate clarity strongly.
• Understanding functional and performance checks improves technical maturity significantly.
• Comparing with integration testing adds practical relevance effectively.
• Revising real project examples strengthens interview confidence naturally.

59. What is bug in software?

Ans:

A bug is an error or flaw causing incorrect software behavior. Bugs may arise from coding mistakes, logic errors, or requirement misunderstandings. They can affect functionality, performance, or security of applications significantly. Testing and debugging processes are used to identify and fix them. Bug concepts are common fresher interview questions.

60. How to prepare bug related concepts properly?

Ans:

• Learning different defect causes builds strong troubleshooting understanding quickly.
• Understanding severity and priority improves technical interview maturity significantly.
• Studying examples like login failures adds practical relevance effectively.
• Revising defect lifecycle terms strengthens confidence naturally.

61. What is debugging?

Ans:

Debugging is the process of locating and correcting software bugs efficiently. Developers analyze code, logs, and outputs to find root causes. It requires logical thinking and systematic problem-solving methods consistently. Good debugging improves software quality and reduces downtime significantly. Debugging basics are often asked in interviews.

62. How to improve debugging preparation?

Ans:

• Learning step-by-step error tracing creates immediate conceptual clarity strongly.
• Using print statements and debuggers improves technical readiness significantly.
• Studying common logical mistakes adds practical value effectively.
• Practicing small coding errors strengthens confidence naturally.

63. What is object oriented programming?

Ans:

Object oriented programming is a programming model based on objects and classes. It organizes code using reusable structures containing data and methods together. Major principles include encapsulation, inheritance, polymorphism, and abstraction concepts. OOP improves maintainability and scalability of large applications significantly. OOP is highly common in technical interviews.

64. How to prepare OOP concepts clearly?

Ans:

• Learning objects, classes, and real-world modeling builds strong fundamentals quickly.
• Understanding four pillars of OOP improves technical clarity significantly.
• Studying Java or C++ examples adds practical relevance effectively.
• Revising definitions regularly strengthens fresher confidence naturally.

65. What is class in programming?

Ans:

A class is a blueprint used to create objects in object oriented programming. It defines attributes and behaviors that objects will contain consistently. Multiple objects can be created from one class design easily. Classes improve code organization and reusability in applications significantly. Class concepts are common fresher interview topics.

66. How to prepare class and object difference?

Ans:

• Learning class as blueprint and object as instance creates immediate clarity strongly.
• Using car and vehicle examples improves practical understanding significantly.
• Understanding memory creation for objects adds technical depth effectively.
• Revising OOP terminology strengthens interview confidence naturally.

67. What is inheritance in OOP?

Ans:

Inheritance is the mechanism where one class acquires properties of another class. It supports code reuse and hierarchical relationships between classes effectively. Parent classes share common features with child classes conveniently. Inheritance improves maintainability and reduces duplicate coding significantly. Inheritance is frequently asked in interviews.

68. How to prepare inheritance basics properly?

Ans:

• Learning parent-child class relationships creates strong conceptual understanding quickly.
• Understanding code reuse benefits improves technical maturity significantly.
• Studying single and multiple inheritance examples adds relevance effectively.
• Revising diagrams strengthens fresher memory naturally.

69. What is polymorphism in OOP?

Ans:

Polymorphism means one interface can represent many different implementations effectively. Methods may behave differently depending on object type or parameters. Compile-time and runtime polymorphism are common forms in programming. This principle increases flexibility and cleaner code design significantly. Polymorphism is a standard interview topic.

70. How to prepare polymorphism concepts clearly?

Ans:

• Learning one name many forms creates immediate clarity strongly.
• Understanding method overloading and overriding improves technical readiness significantly.
• Using shape or animal examples adds practical relevance effectively.
• Revising comparisons with inheritance strengthens memory naturally.

71. What is encapsulation in OOP?

Ans:

Encapsulation is the bundling of data and methods inside one unit. It also controls access to internal data using access modifiers carefully. This protects sensitive information from unauthorized direct modification. Encapsulation improves security and maintainability of software systems significantly. Encapsulation is common in fresher interviews.

72. How to prepare encapsulation basics properly?

Ans:

• Learning data hiding purpose creates strong conceptual understanding quickly.
• Understanding private and public access improves technical clarity significantly.
• Studying getter and setter examples adds practical value effectively.
• Revising OOP pillars strengthens interview confidence naturally.

73. What is abstraction in OOP?

Ans:

Abstraction means showing essential features while hiding unnecessary implementation details. It helps users focus on what an object does rather than internals. Abstract classes and interfaces are common ways to implement abstraction. This principle simplifies complex software systems significantly in design. Abstraction is frequently asked in technical interviews.

74. How to prepare abstraction concepts clearly?

Ans:

• Learning visible behavior versus hidden implementation creates immediate clarity strongly.
• Understanding interfaces and abstract classes improves technical maturity significantly.
• Using ATM or vehicle examples adds practical relevance effectively.
• Revising all OOP pillars strengthens memory naturally.

75. What are final tips for third stage Infosys technical preparation?

Ans:

Strong knowledge of testing and object oriented concepts improves fresher interview performance greatly. Candidates should explain principles using simple real-world examples confidently. Understanding differences between related topics creates stronger technical impressions significantly. Regular revision of terminology and examples improves retention effectively. Consistent practice increases chances of final success strongly.

76. What is cloud computing?

Ans:

Cloud computing is the delivery of computing resources through the internet on demand. It provides servers, storage, databases, networking, and software services remotely. Organizations use cloud platforms to reduce hardware costs and scale quickly. Popular platforms include AWS, Azure, and Google Cloud solutions globally. Cloud basics are common in fresher technical interviews.

77. How to prepare cloud computing basics clearly?

Ans:

• Learning on-demand resource delivery creates strong conceptual understanding quickly for beginners.
• Understanding cost savings and scalability benefits improves technical maturity significantly.
• Studying AWS, Azure, and Google Cloud examples adds practical relevance effectively.
• Revising service models strengthens fresher interview confidence naturally.

78. What is virtualization?

Ans:

Virtualization is the creation of virtual versions of physical computing resources. It allows multiple virtual machines to run on one physical server efficiently. This improves hardware utilization and reduces infrastructure costs significantly. Virtualization is widely used in cloud and enterprise data centers. This topic is often asked in interviews.

79. How to prepare virtualization concepts properly?

Ans:

• Learning virtual resource creation builds immediate conceptual clarity strongly.
• Understanding multiple operating systems on one server improves technical readiness significantly.
• Studying relation between virtualization and cloud adds practical value effectively.
• Revising hypervisor basics strengthens memory naturally.

80. What is API?

Ans:

API stands for Application Programming Interface used for software communication. It allows different applications to exchange data and functionality efficiently. APIs help connect mobile apps, websites, payment systems, and services. They improve modular development and integration across platforms significantly. API basics are highly common in interviews.

81. How to prepare API basics clearly?

Ans:

• Learning software-to-software communication purpose creates strong understanding quickly.
• Understanding request and response flow improves technical maturity significantly.
• Studying payment gateway or weather app examples adds relevance effectively.
• Revising common API terms strengthens confidence naturally.

82. What is REST API?

Ans:

A REST API is an API following Representational State Transfer principles. It uses HTTP methods such as GET, POST, PUT, and DELETE. REST APIs are lightweight, scalable, and widely used in web systems. They commonly exchange data using JSON formatted responses efficiently. REST basics are common fresher interview topics.

83. How to prepare REST API concepts properly?

Ans:

• Learning REST as web service architecture creates immediate conceptual clarity strongly.
• Understanding HTTP methods improves technical readiness significantly during interviews.
• Studying JSON response examples adds practical relevance effectively.
• Comparing REST with SOAP strengthens memory naturally.

84. What is JSON?

Ans:

JSON stands for JavaScript Object Notation used for data exchange. It stores information in key-value format that is easy to read. JSON is lightweight and widely used in APIs and web applications. It supports arrays, nested objects, and structured communication efficiently. JSON basics are often asked in interviews.

85. How to prepare JSON concepts clearly?

Ans:

• Learning key-value data format creates strong beginner understanding quickly.
• Understanding why JSON is lightweight improves technical clarity significantly.
• Studying API response examples adds practical relevance effectively.
• Revising syntax basics strengthens interview confidence naturally.

86. What is version control system?

Ans:

A version control system manages changes made to source code over time. It helps teams track history, collaborate safely, and restore older versions. Popular tools include Git, SVN, and Mercurial across industries. Version control is essential in modern software development workflows. This topic is common in fresher interviews.

87. How to prepare version control basics properly?

Ans:

• Learning code history management creates immediate conceptual clarity strongly.
• Understanding teamwork collaboration benefits improves technical maturity significantly.
• Studying Git commands like commit and push adds practical value effectively.
• Revising branching basics strengthens memory naturally.

88. What is Git?

Ans:

Git is a distributed version control system used by developers globally. It tracks file changes and supports branching for parallel development efficiently. Git helps teams merge code and maintain project history safely. Platforms like GitHub and GitLab commonly use Git repositories. Git basics are frequently asked in interviews.

89. How to prepare Git interview concepts clearly?

Ans:

• Learning distributed version control meaning creates strong understanding quickly.
• Understanding commit, branch, merge, and clone improves readiness significantly.
• Studying GitHub workflow examples adds practical relevance effectively.
• Practicing command usage strengthens fresher confidence naturally.

90. What are final success tips for Infosys technical interviews?

Ans:

Success depends on strong fundamentals, consistent revision, and clear technical communication skills. Candidates should understand programming, databases, networks, testing, and cloud basics thoroughly. Simple structured answers often create stronger impressions than memorized complexity alone. Practicing common questions and real examples improves confidence significantly. Consistent preparation gives the best chance of fresher selection success.