Explain difference between smoke, sanity and regression testing?

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Smoke testing is a quick test to check if the build is stable, sanity testing is a subset of regression testing focusing on specific areas, and regression testing is a comprehensive test to ensure no new bugs are introduced.

Smoke testing is a preliminary test to check if the critical functionalities work without major issues after a build is deployed.
Sanity testing is a subset of regression testing that focuses on specific areas or functionalities to ensure they still work after changes.
Regression testing is a comprehensive test that ensures no new bugs are introduced and existing functionalities still work as expected after changes.
Example: After a new feature is added, smoke testing ensures the basic functionalities still work, sanity testing focuses on the new feature, and regression testing covers the entire application.

Explain difference between smoke, sanity and regression testing?

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