difference between regression and retesting

Question

Accepted Answer

Regression testing is testing the entire system after changes while retesting is testing only the failed test cases.

Regression testing is done to ensure that changes made to the system do not affect the existing functionality.
Retesting is done to ensure that the defects found in the previous test cycle have been fixed.
Regression testing is done after every build while retesting is done after every defect fix.
Regression testing is time-consuming while retesting is less time-consuming.
Example: If a defect was found in the login functionality and it was fixed, retesting will be done only on the login functionality while regression testing will be done on the entire system.

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