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Captcha -- The Word Verification Technique

Browsing through an article on PlanetRDF.com made me learn a new geek word. I just know that there is also a proper word for the "word verification" techniques to prevent automated operation of Web software by computer codes (see image below).



As pointed by the Planet RDF article, according to Wikipedia, this proper word is "captcha", an acronym for "completely automated public turing test to tell computers and humans apart."

Captcha is a type of challenge-response test used in computing to determine whether or not the user is human, a common type of which requires that the user type the letters of a distorted and/or obscured sequence of letters or digits that appears on the screen.

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