Difference between retesting and regression testing

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Retesting is testing the same functionality again after fixing the defects while regression testing is testing the entire system after making changes to ensure that the changes did not affect the existing functionality.

Retesting is done to ensure that the defects reported earlier have been fixed.
Regression testing is done to ensure that the changes made to the system did not affect the existing functionality.
Retesting is a subset of regression testing.
Regression testing is time-consuming and requires a lot of effort.
Example of retesting: Testing a login functionality after fixing the defect that was causing login failure.
Example of regression testing: Testing the entire system after adding a new feature to ensure that the existing features are not affected.

Difference between retesting and regression testing

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