Here are 50 commonly asked software testing interview questions and their answers:

1. What is software testing? Answer: Software testing is the process of evaluating and verifying a software application or system to ensure it functions correctly, meets requirements, and is free of bugs and errors.

2. What are the different types of software testing? Answer: There are several types of software testing, including functional testing, non-functional testing, performance testing, security testing, and usability testing.

3. What is a test case? Answer: A test case is a set of conditions or variables that are tested to determine if the software application or system meets its requirements.

4. What is regression testing? Answer: Regression testing is the process of testing changes to a software application or system to ensure that previously working features still work correctly.

5. What is the difference between verification and validation? Answer: Verification is the process of checking whether a software application or system meets its specified requirements. Validation is the process of checking whether the software application or system meets the needs of the end-users.

6. What is a defect? Answer: A defect is an error or bug in a software application or system that causes it to behave incorrectly.

7. What is test coverage? Answer: Test coverage is the degree to which a software application or system has been tested. It measures the percentage of code or functionality that has been covered by the tests.

8. What is boundary value testing? Answer: Boundary value testing is a testing technique that involves testing inputs at or near the boundaries of acceptable values to ensure that the software application or system behaves correctly.

9. What is black box testing? Answer: Black box testing is a testing technique that focuses on testing the software application or system without knowing its internal structure or code.

10. What is white box testing? Answer: White box testing is a testing technique that focuses on testing the software application or system with knowledge of its internal structure or code.

11. What is exploratory testing? Answer: Exploratory testing is a testing technique that involves testing the software application or system without a defined test plan or test script.

12. What is the difference between smoke testing and sanity testing? Answer: Smoke testing is a type of testing that checks whether the software application or system can perform its basic functions. Sanity testing is a type of testing that checks whether the changes made to the software application or system work as expected.

13. What is a test plan? Answer: A test plan is a document that outlines the testing approach, objectives, and scope for a software application or system.

14. What is the difference between a test plan and a test case? Answer: A test plan is a document that outlines the testing approach, objectives, and scope for a software application or system. A test case is a set of conditions or variables that are tested to determine if the software application or system meets its requirements.

15. What is load testing? Answer: Load testing is a type of testing that checks whether the software application or system can handle the expected user load.

16. What is stress testing? Answer: Stress testing is a type of testing that checks whether the software application or system can handle the maximum expected load or stress.

17. What is acceptance testing? Answer: Acceptance testing is a type of testing that checks whether the software application or system meets the needs of the end-users and is ready for deployment.

18. What is usability testing? Answer: Usability testing is a type of testing that checks whether the software application or system is easy to use and navigate for the end-users.

19. What is the difference between positive testing and negative testing? Answer: Positive testing checks whether the software application or system behaves correctly when given valid input. Negative testing checks whether the software application or system behaves correctly when given invalid input.

    20. What is the difference between static testing and dynamic testing? Answer: Static testing is a type of testing that checks the software application or system without executing the code, such as reviewing the code or requirements. Dynamic testing is a type of testing that checks the software application or system by executing the code.

    21. What is compatibility testing? Answer: Compatibility testing is a type of testing that checks whether the software application or system is compatible with different hardware, operating systems, and browsers.

    22. What is a test harness? Answer: A test harness is a tool or software application that automates the testing process, such as running tests, generating test reports, and tracking defects.

    23. What is test automation? Answer: Test automation is the process of using software tools or applications to automate the testing process, such as running tests, generating test reports, and tracking defects.

    24. What is a test script? Answer: A test script is a set of instructions or code that is used to execute a test case automatically.

    25. What is a test suite? Answer: A test suite is a collection of test cases or test scripts that are executed together to test a software application or system.

    26. What is a defect tracking system? Answer: A defect tracking system is a tool or software application that is used to track defects or bugs found during testing.

    27. What is a test environment? Answer: A test environment is a setup or configuration of hardware, software, and other resources required to perform testing.

    28. What is test data? Answer: Test data is a set of inputs or values that are used to execute a test case or test script.

    29. What is code coverage? Answer: Code coverage is a measure of the percentage of code that is executed during testing.

    30. What is release management? Answer: Release management is the process of managing the release and deployment of software applications or systems.

    31. What is traceability matrix? Answer: A traceability matrix is a tool or document that is used to trace the relationship between requirements, test cases, and defects.

    32. What is a test log? Answer: A test log is a document that records the details of the testing process, such as the date and time of testing, the test cases executed, and the results of testing.

    33. What is ad-hoc testing? Answer: Ad-hoc testing is a type of testing that involves testing the software application or system without a defined test plan or test script.

    34. What is test-driven development (TDD)? Answer: Test-driven development is a development process that involves writing automated tests before writing the code.

    35. What is behavior-driven development (BDD)? Answer: Behavior-driven development is a development process that involves defining the behavior of the software application or system in a way that is easily understandable by both technical and non-technical stakeholders.

    36. What is the difference between quality assurance and testing? Answer: Quality assurance is the process of ensuring that a software application or system meets the specified requirements and standards. Testing is a part of quality assurance that checks whether the software application or system meets the specified requirements and standards.

    37. What is monkey testing? Answer: Monkey testing is a type of testing that involves randomly testing the software application or system without a defined test plan or test script.

    38. What is a defect life cycle? Answer: A defect life cycle is the stages that a defect goes through from identification to resolution, such as reporting, triaging, assigning, fixing, and verifying.

    39. What is the difference between manual testing and automated testing? Answer: Manual testing is the process of testing the software application or system manually without using any tools or applications. Automated testing is the process of testing the software application or system using software tools or applications.

    40. What is 

        the difference between regression testing and retesting? Answer: Regression testing is a type of testing that checks whether the changes or enhancements made to the software application or system have affected the existing functionality. Retesting is a type of testing that checks whether the defects or bugs that were identified during testing have been fixed correctly.

        41. What is the difference between positive testing and negative testing? Answer: Positive testing is a type of testing that checks whether the software application or system behaves as expected when provided with valid inputs. Negative testing is a type of testing that checks whether the software application or system behaves as expected when provided with invalid or unexpected inputs.

        42. What is the difference between smoke testing and sanity testing? Answer: Smoke testing is a type of testing that checks whether the critical functionalities of the software application or system are working properly after a new build or release. Sanity testing is a type of testing that checks whether the defects or bugs that were identified during testing have been fixed correctly.

        43. What is the difference between load testing and stress testing? Answer: Load testing is a type of testing that checks whether the software application or system can handle a specific amount of load or users. Stress testing is a type of testing that checks whether the software application or system can handle a high amount of load or users.

        44. What is a defect density? Answer: Defect density is a measure of the number of defects or bugs present in the software application or system per unit of code or functionality.

        45. What is a test management tool? Answer: A test management tool is a software application that is used to manage the testing process, such as creating test plans, managing test cases, executing tests, and generating test reports.

        46. What is usability testing? Answer: Usability testing is a type of testing that checks whether the software application or system is easy to use and understand by the end-users.

        47. What is security testing? Answer: Security testing is a type of testing that checks whether the software application or system is secure and protected against unauthorized access or attacks.

        48. What is exploratory testing? Answer: Exploratory testing is a type of testing that involves testing the software application or system without a defined test plan or test script, but rather exploring the software application or system and discovering defects or bugs.

        49. What is a test plan? Answer: A test plan is a document that outlines the testing approach, scope, objectives, resources, and timelines for a software application or system.

        50. What is acceptance testing? Answer: Acceptance testing is a type of testing that checks whether the software application or system meets the acceptance criteria or requirements of the end-users or stakeholders. Join Us For : Software Testing Course in Chennai