Captchas
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a system that is used to make sure that a human being, not a machine, is using a computer. The person may be asked to type in a series of letters or numbers, or to complete a simple game. The word captcha is made up of the first letters of words in the phrase Completely Automated Public Turing test to tell Computers and Humans Apart:
Captchas meaning & definition 1 of Captchas.
