Regression Testing Checklist is a tool used to ensure that all changes made to a software application are fully tested. It is used to identify any potential issues that may arise as a result of changes to the existing code. The Checklist includes tests that should be conducted to ensure that functionality, performance, and reliability are not adversely affected. Tests may include examining the impact of changes on the existing code, testing new code and configurations, and data integrity checks. Regression Testing Checklist also helps to identify and address any issues quickly and effectively. By following the Checklist, developers can ensure that their software application runs as expected and is reliable.