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What is the main purpose of regression testing?

  1. To validate new functionality

  2. To ensure previously developed features still work after changes

  3. To test the system as a whole

  4. To assess user interface design

The correct answer is: To ensure previously developed features still work after changes

The main purpose of regression testing is to ensure that previously developed features still function correctly after changes have been made to the software. When modifications, such as bug fixes, updates, or new feature implementations, are applied to a system, there is a risk that these changes could unintentionally disrupt existing functionality. Regression testing involves running a suite of tests that specifically target these established features to confirm that they remain unaffected by the recent changes. This type of testing is crucial in maintaining the integrity and reliability of the software product throughout its lifecycle. By focusing on existing features, regression testing helps to catch any potential issues early, thereby enhancing overall product quality and user satisfaction.