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Smoke testing is a shallow and wide approach whereby all areas of the application without getting into too deep, is tested.
Smoke testing is conducted to ensure whether the most crucial functions of a program are working, but not bothering with finer details.
Sanity test is a narrow regression test that focuses on one or a few areas of functionality.
After receiving a software build, with minor changes in code, or functionality, Sanity testing is performed to ascertain that the bugs have been fixed and no further issues are introduced due to these changes. The goal is to determine that the proposed functionality works roughly as expected. If sanity test fails, the build is rejected to save the time and costs involved in a more rigorous testing.
