Difference between re-testing and regression testing.

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Re-testing is testing the same functionality again to ensure the defect has been fixed, while regression testing is testing the unchanged parts of the software to ensure no new defects have been introduced.

Re-testing focuses on the specific defect that was fixed, while regression testing focuses on ensuring that the rest of the software still works as expected.
Re-testing is done after a defect is fixed, while regression testing is done after new code changes are made.
Re-testing is usually performed by the tester who found the defect, while regression testing can be performed by any tester.
Example: Re-testing would involve testing a login functionality again after a bug related to incorrect password validation has been fixed. Regression testing would involve testing other parts of the software to ensure the fix did not introduce new issues.

Difference between re-testing and regression testing.

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