What is the primary purpose of regression testing?

The primary purpose of regression testing is to ensure that changes made to the software—whether fixing a defect, enhancing existing functionality, or adding new features—do not introduce new issues in areas that were previously functioning correctly. This type of testing is crucial because it validates that existing functionality remains intact after modifications are made.

When new code is introduced, there is always a risk that it might unintentionally affect existing code. Regression testing helps to mitigate this risk by running previously conducted tests to confirm that the software behaves as expected and that no new defects have emerged as a result of the changes. This process is vital for maintaining the overall quality and reliability of the software throughout its development lifecycle.