It is a type of testing in which one will perform testing on the already tested functionality again and again this is usually done in scenarios (Situations).
Scenario 1:
Whenever the defects are raised by the Test Engineer rectified by the developer and the next build is released to the testing department then the Test Engineer will test the defect functionality and its related functionalities once again.
Scenario 2:
Whenever some new changes are requested by the customer, those new features are incorporated by the developers, next built is released to the testing department then the test engineers will test the related functionalities of the new features once again which are already tested. That is also known as regression testing.
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