What is retesting and regression testing?

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Retesting is testing the same functionality again after fixing the defects. Regression testing is testing the entire system after making changes to ensure that existing functionalities are not impacted.

Retesting is done to ensure that the defects reported earlier have been fixed and the functionality is working as expected.
Regression testing is done to ensure that the changes made to the system have not impacted the existing functionalities.
Retesting is a subset of regression testing.
Regression testing is time-consuming and requires a comprehensive test suite.
Example: After fixing a defect in the login functionality, retesting is done to ensure that the login is working as expected. After making changes to the payment gateway, regression testing is done to ensure that the existing functionalities like login, cart, and checkout are not impacted.

What is retesting and regression testing?

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