A captcha is a recognition system to determine if the user accessing an application is a human or a machine that processes data automatically. It is used in forms on web pages, most commonly by means of an image that may contain letters or numbers, which are generally distorted so that they are not easily readable. The user who completes the form must write the text that is in the image so that it is correctly loaded. Deformed images are difficult to read by machines, but the human user is able to understand them easily.
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