Difference between regression testing and retesting?

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Regression testing is testing the unchanged parts of the software after modifications, while retesting is testing the fixed defects.

Regression testing ensures that the existing functionality is not affected by changes.
Retesting is performed to verify that the defects reported in earlier testing have been fixed.
Regression testing is typically performed after every modification or enhancement to the software.
Retesting is performed after the defects have been fixed to ensure they are resolved.
Regression testing focuses on the broader impact of changes on the system.
Retesting focuses on the specific defects that were reported and fixed.
Regression testing may involve running a comprehensive test suite.
Retesting may involve running a subset of test cases that cover the fixed defects.
Regression testing helps prevent the introduction of new defects.
Retesting helps ensure that the fixed defects do not reoccur.

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