A CAPTCHA stands for "Completely Automated Public Turing Test to tell Computers and Humans Apart"
It is a type of challenge-response test used in computing to determine whether or not the user is human. A common type of CAPTCHA requires that the user types the letters of a distorted image, usually with obscured sequence of letters or digits that appear in a little box on the screen.
Resource: http://en.wikipedia.org/wiki/Captcha
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