CAPTCHA is a computer challenge-response test used to determine whether the user is human or computer robot.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. They are not always easy for humans, though. If a correct solution is received, it can be presumed to have been entered by a human.
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