A CAPTCHA is a type of challenge-response test used in computing to determine whether or not the user is human. There are different types of captchas that are used, like reCaptcha (a new type), inverted captchas, word-based captchas, and image-based captchas. Companies use Captchas to prevent blog spam, access bots, and to make a website more secure. Captcha is an abbreviation for "Completely Automated Public Turing Test," which is used to distinguish between computers and humans. The basic goal of Captcha is to determine whether the user is human or a bot. You may have already solved a number of captchas while filling out a form or registering for a website.
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