What is meant by regression and retesting?

Question

Accepted Answer

Regression is testing to ensure changes do not affect existing functionality. Retesting is testing to ensure defects have been fixed.

Regression testing is done to ensure that changes made to the software do not affect the existing functionality.
Retesting is done to ensure that defects found during testing have been fixed.
Regression testing is done after every change to the software.
Retesting is done after a defect has been fixed.
Regression testing is automated to save time and effort.
Retesting can be manual or automated depending on the complexity of the defect.
Example: If a bug was found during testing that caused the login page to crash, retesting would be done after the bug is fixed to ensure the login page works properly.
Example: If a new feature is added to the software, regression testing would be done to ensure that the existing features still work as expected.

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