What is regression testing ??

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Regression testing is the process of testing changes made to a software application to ensure that existing functionality still works as expected.

It involves re-executing test cases that have been previously run to ensure that any changes made to the software have not adversely affected existing functionality.
It is typically performed after a software update or change has been made.
Regression testing can be done manually or through automated testing tools.
Examples of regression testing include testing the login functionality of a website after a code update or testing the functionality of a mobile app after a new feature has been added.