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A captcha is a type of challenge-response test used in computing as an attempt to ensure that the response is generated by a human being. the process usually involves a computer asking a user to complete a simple test which the computer is able to grade. these tests are designed to be easy for a computer to generate but difficult for a computer to solve, but again easy for a human. if a correct solution is received, it can be presumed to have been entered by a human.