CAPTCHAs: What They Are and How to Solve Them
Sep 02, 2010 · Facebook Facebook. Twitter Twitter. Sandra Grauschopf. Updated April 28, 2021. A CAPTCHA is a test that checks whether a human, not a computer program, is submitting an online form. It's intended to prevent bots, automatic sweepstakes entry services, hackers, and similar automatic logins from cheating the system.
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