Ever wonder why so many websites ask you to enter squiggly, distorted pass codes? They are using captcha to verify your humanity. A captcha is an automated test that humans can pass, but computers can not. To learn more, read the definitions from Webopedia or Wikipedia. Or dive into Carnegie Mellon’s Captcha Project.

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Feldman, Barbara. "CAPTCHA." Surfnetkids. Feldman Publishing. 15 Feb. 2005. Web. 27 Apr. 2015. < >.

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By . Originally published February 15, 2005. Last modified February 15, 2005.