Explain what you understand by the terms: Regression Testing and Re-Testing?

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Regression Testing:
Running tests to ensure that the software has not regressed in anyway as a result of changes to the software and/or environment. Regression testing is running passed tests again to ensure that they still pass. Re-Testing

This is running a test again that had found a fault to check that the fault has been fixed correctly. Re-testing is running a failed test again to ensure that it now passes.
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