What is regression testing, retesting

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Regression testing is retesting of software to ensure that new code changes have not adversely affected existing functionality.

Regression testing involves running previously executed test cases to verify that new code changes have not introduced any new bugs or issues.
Retesting is the process of running failed test cases again after the bugs have been fixed to ensure they have been resolved.
Regression testing is typically automated to save time and effort in retesting.
It is important to perform regression testing regularly to maintain the quality of the software.
Examples: After adding a new feature to a website, regression testing is done to ensure that existing features still work correctly. Retesting is done on a bug that was fixed to confirm it is resolved.

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