Difference between sanity, smoke and regression testing

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Sanity testing is a quick test to check if the software is stable, smoke testing is a subset of sanity testing focusing on critical functionalities, and regression testing is retesting after code changes.

Sanity testing is a narrow and deep testing to ensure that the most critical functionalities work correctly after changes.
Smoke testing is a broad and shallow testing to ensure that the basic functionalities work before further testing.
Regression testing is retesting the software after changes to ensure that the existing functionalities are not affected.
Example: Sanity testing would focus on critical features like login functionality, smoke testing would check if the software launches without errors, and regression testing would retest all functionalities after a code change.

Difference between sanity, smoke and regression testing

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