Short for Completely Automated Public Turing test to tell Computers and Humans Apart, CAPTCHA is an authentication mechanism that distinguishes human users from automated programs (bots). By presenting challenges such as distorted text or image recognition tasks that only humans can reliably solve, it prevents automated spam submissions and abuse.

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• 2010h22h #75電子掲示板やブログに投稿するとき，図のようなゆがんだ文字の画像が表示され，それを読み取って入力するよう求められることがある。その目的はどれか。 # Jは