What are the differences between sanity testing, smoke testing, retesting, and regression testing?

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Accepted Answer

Sanity, smoke, retesting, and regression are types of testing performed during software development.

Sanity testing: Quick test to check if the software is stable enough for further testing.
Smoke testing: Initial testing to ensure the basic functionalities of the software are working.
Retesting: Testing done to verify that a specific bug or issue has been fixed.
Regression testing: Testing done to ensure that new code changes have not adversely affected existing functionalities.
Example: After fixing a critical bug, retesting is done to confirm the bug is resolved.

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