Software Testing interviews can be challenging, especially for freshers and professionals who want to prove both theoretical knowledge and practical understanding.This article compiles the top 20 software testing interview questions and answers that will help you get ready for your next job opportunity — whether it’s Manual, Automation, or QA role. 🧠 1. What is Software Testing? Answer:Software Testing is the process of evaluating a software application to ensure it meets the specified requirements and is free of defects. The goal is to identify bugs, errors, or missing functionalities before deployment. 🧠 2. Why is Testing Important? Answer:Testing ensures product quality, reliability, and performance. It helps detect defects early, saves cost, and improves user satisfaction. 🧠 3. What are the Different Levels of Testing? Answer: Unit Testing – Testing individual components. Integration Testing – Verifying combined modules. System Testing – End-to-end testing of the entire system. Acceptance Testing – Validating the product with client requirements. 🧠 3. What are the Different Levels of Testing? Answer: Unit Testing – Testing individual components. Integration Testing – Verifying combined modules. System Testing – End-to-end testing of the entire system. Acceptance Testing – Validating the product with client requirements. 🧠 3. What are the Different Levels of Testing? Answer: Unit Testing – Testing individual components. Integration Testing – Verifying combined modules. System Testing – End-to-end testing of the entire system. Acceptance Testing – Validating the product with client requirements. 🧠 4. What are the Types of Software Testing? Answer: Manual Testing Automation Testing Black Box Testing White Box Testing Smoke Testing Regression Testing Sanity Testing 🧠 5. What is the Difference Between Verification and Validation? Verification Validation Ensures product is built correctly. Ensures right product is built. Done during development. Done after development. Example: Reviewing documents. Example: Functional testing. 🧠 6. What is a Test Case? Answer:A test case is a set of conditions or variables used to determine whether a system works as expected. It includes test steps, expected results, and actual results. 🧠 7. What is a Bug / Defect? Answer:A bug or defect is an error or flaw in software that produces incorrect or unexpected results. 🧠 8. What are Severity and Priority? Term Meaning Severity Impact of a defect on the system. Priority Urgency to fix the defect. Example: A spelling error in the homepage has low severity but high priority. 🧠 9. What is Regression Testing? Answer:It ensures that new code changes do not adversely affect the existing functionality of the application. 🧠 10. What is Smoke Testing? Answer:Smoke Testing is a basic check to verify that the critical functionalities of an application are working. It’s often called “Build Verification Testing.”