what is regrassion testing? how to perform sanity testing?diffrence between validation and verification?how to write script?defect life cycle ?selenium tools ?

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Answering questions related to manual testing, regression testing, sanity testing, validation and verification, script writing, defect life cycle, and Selenium tools.

Regression testing is the process of testing changes made to an application to ensure that existing functionality still works as expected.
Sanity testing is a quick test to ensure that the application is stable enough for further testing.
Validation is the process of ensuring that the product meets the customer's requirements.
Verification is the process of ensuring that the product meets the specified requirements.
Script writing involves creating automated test scripts to test the application.
Defect life cycle includes the stages of defect identification, logging, prioritization, fixing, retesting, and closure.
Selenium is a popular open-source tool used for automating web browsers.

what is regrassion testing? how to perform sanity testing?diffrence between validation and verification?how to write script?defect life cycle ?selenium tools ?

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