What is Regression testing, when to perform regression test, Automation tools for Regression testing

Know everything about:
What is Regression testing?
Difference between retesting and regression testing
When is regression testing performed
Automation tools for regression testing: Selenium, Katalon Studio, TestComplete, TestSigma

Video link of Retesting:    • What is Retesting? Example of Retesting?  

Practice Website for automation: https://automationexercise.com. Also, provided list of test cases and APIs for automation exercise in this website.

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