Functional testing is a type of software testing which is to verify that each function of the software application behaves as specified in the requirement document. It tests all the functionalities by providing appropriate input to verify whether the actual output is matching the expected output or not. Testers who do functional testing focuses mainly on black-box testing and need not concern about the application source code.

It falls within the scope of black-box testing and the testers need not concern about the source code of the application.

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