Oops that is incorrect. Short for Completely Automated Public Turing test to tell Computers and Humans Apart, captcha is a type of protection that easily identifies humans from computers. A commonly used captcha is an image that is distorted that contains text that is easy for humans to read but difficult or impossible for computers to read. The image to the right is an example of a captcha. See our captcha definition for additional information and related links.

Of the 32,496 people who have answered this quiz question 12,570 have answered it correctly and 19,926 have answered it incorrectly. Based off these results this question has been given a difficulty level of hard.

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