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Test automation is gradually taking over manual testing as it saves time and improves the quality of testing. Especially in the case of regression testing, automation can improve efficiency by manifold. It is a waste of time and resources to do repetitive testing manually. Also, there is a scope for an error as repetitive testing can be exhausting but the chances of errors occurring in automation are slim. But what is automation testing? In simple terms, automation testing is replacing manual human activity with a system that performs test cases by repeating predefined actions. To get the most out of automation it is necessary to select the right automation testing tool.