Black Box Testing is the one in which the tester will be aware of the input and the expected output details but will not know anything about the internal working.
The tester will simply provide the system input and then analyze the output that will be produced. Black Box Testing is a very powerful testing technique because it exercises a system from the start to the very end.
This testing scheme is entirely based on software. All the design, structure, and code of the system are unknown to the tester. This technique entirely focuses on the external behavior of the system rather than the internal function. Most commonly used in unit integration, system testing, and acceptance, etc.
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