Difference between smoke and sanity? Regression and retesting?

Question

Accepted Answer

Smoke and sanity are initial testing techniques while regression and retesting are done after changes are made.

Smoke testing is done to check if the basic functionalities of the application are working fine while sanity testing is done to check if the major functionalities are working fine.
Regression testing is done after changes are made to ensure that the changes have not affected the existing functionalities while retesting is done to ensure that the defects found in previous testing have been fixed.
Smoke and sanity testing are done before regression and retesting.
Smoke and sanity testing are done on a build while regression and retesting are done on a release candidate.

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