[Answer] What computer program is a "Turing Test" designed to ensure that a user is human?

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What computer program is a "Turing Test" designed to ensure that a user is human?

• CAPTCHA:A CAPTCHA is an acronym 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 a user is human. The most common type of CAPTCHA requires entering a sequence of letters or numbers in a distorted image. Many websites use it as part of a fraud prevention strategy in which they asked humans to "retype distorted text that programs have difficulty recognizing." There are many variations of Turing tests, all with the same intention of detecting whether a respondent is a human or a machine.

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