What is CAPTCHA?

This is a Captcha

Here is the Webopedia definition:

Short for completely automated public turing test to tell computers and humans apart, a technique used by a computer to tell if it is interacting with a human or another computer.

via What is CAPTCHA? – A Word Definition From the Webopedia Computer Dictionary.

According to the experts machines are getting better at reading captchas so we can expect the to become even more obscure.

by: Larry Emmott at February 27, 2012.