Regression testing and Re-testing difference. Smoke testing and Sanity testing.

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Regression testing verifies if changes have affected existing functionality. Re-testing checks if defects have been fixed. Smoke testing checks basic functionality. Sanity testing checks major functionality.

Regression testing is done to ensure that changes made to the software do not affect existing functionality.
Re-testing is done to check if defects found in previous testing have been fixed.
Smoke testing is done to check if basic functionality of the software is working.
Sanity testing is done to check if major functionality of the software is working.
Regression testing and re-testing are done after changes have been made to the software.
Smoke testing and sanity testing are done before any major testing is done.
Example of regression testing: testing a new feature and making sure it does not affect existing features.
Example of re-testing: testing a defect that was found and verifying that it has been fixed.
Example of smoke testing: testing if the software can be installed and launched.
Example of sanity testing: testing if the login functionality is working.

Regression testing and Re-testing difference. Smoke testing and Sanity testing.

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