Regression Testing Techniques: Retest All: Retest All In this technique, the entire test suite is executed again to verify that no existing functionality has been affected by recent code changes. It's a comprehensive but time-consuming approach. Selective Regression Testing: Selective Regression Testing This technique involves selecting a subset of test cases from the existing test suite that is most likely to be affected by the code changes. It's a more efficient approach compared to retesting all test cases. Test Case Prioritization: Test Case Prioritization Test cases are prioritized based on factors like their likelihood of failure, criticality, and importance to the application. High-priority test cases are executed first to quickly identify issues. Test Automation: Test Automation tools are used to create and execute test scripts that can be easily rerun whenever there are code changes. Popular automation tools include Selenium, Appium, and JUnit for Java applications.