A program or system intended to distinguish human from machine input, typically as a way of thwarting spam and automated extraction of data from websites.
- The spammers are thinking up ever more ingenious ways to break the captchas.
- Every time you edit a page, you have to pass a captcha.
- I guess the spammers tools are too simplistic to even attempt to break the captcha.
Early 21st century: acronym from completely automated public Turing test to tell computers and humans apart.
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