CAPTCHA is an abbreviation of "Completely Automated Public Turing test to tell Computers and Humans Apart".

CAPTCHA is a form of visual confirmation used in websites to confirm that an action is not performed by a computer (bot).

CAPTCHA is actually an image that contains a text. The user must type the text displayed in the image to confirm that it is a person, not a computer (bot).

CAPTCHA is commonly used in web forms to filter SPAM.

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