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15:37, March 15, 2013 A '''CAPTCHA''' (acronym for '''C'''ompletely '''A'''utomated '''P'''ublic '''T'''uring Test To Tell '''C'''omputers and '''H'''umans '''A'''part<ref>http://www.captcha.net</ref>) is a type of test on the internet that determines whether the current user is a human or an [[internet bot]]. CAPTCHAs are used to prevent bots from performing certain tasks, such as creating user accounts.
==Types==
===Image to text===
This type of CAPTCHA is an image that contains hard-to-read text that is supposed to be only readable by a human. To pass the test, the human must type the text that they see in the image, and the website will determine if it is correct.
==Use==
CAPTCHAs are used in [[wiki]]s, such as [[Conservapedia]] and [[Wikipedia]], to prevent automated account creation and automated external link addition.
==References==
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