In theory, computers can recognize text from images - but to do so reliably, they need a clean, crisp image. The entrant needs to type those characters before they can submit the form. The most common CAPTCHAs display a series of letters and numbers. They also prevent fraudulent sweepstakes entries and illegitimate votes in contests. They prevent hackers from performing "brute force" attacks where they try to break into an account by guessing every possible password combination. What's behind the funny name? CAPTCHA is an acronym that stands for "Completely Automated Public Turing Test to tell Computers and Humans Apart." A Turing Test is a test for intelligence in a computer or a program.ĬAPTCHAs have a wide range of applications. It's intended to prevent bots, automatic sweepstakes entry services, hackers, and similar automatic logins from cheating the system. A CAPTCHA is a test that checks whether a human, not a computer program, is submitting an online form.
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