CAPTCHA

CAPTCHA is a contrived acronym for “Completely Automated Public Tuning test to tell Computers and Humans Apart.” CAPTCHAs present a user with a challenge, usually to correctly type in a series of letters and/or numbers, to prove that the user is not a bot. Google offers a CAPTCHA option for its Gmail application that requires users to answer basic math questions in order to send an email. The Gmail CAPTCHA feature is called “Mail Goggles,” a reference to “beer goggles,” and is designed not to prevent bots from sending messages but to prevent users from sending emails while intoxicated.