It is a testing performed during change management (when a function/ module/ program is changed or added to the existing software) in order to ensure that new/ changed functions executes properly and integrates with other module as expected.
The purpose of regression testing is to confirm that a recent program or code change has not adversely affected existing features.
Regression testing is nothing but full or partial selection of already executed test cases which are re-executed to ensure existing functionalities work fine.
This testing is done to make sure that new code changes should not have side effects on the existing functionalities. It ensures that old code still works once the new code changes are done.
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