Captcha is an acronym for “completely automated public Turing test to tell computers and humans apart”. It is a method of differentiating human users from “bots”, software that tries to make use of your website / online tools. Captchas can help protect information and your storage/bandwidth from being eaten up by automated processes. Normal Captchas are text based with small letters capital letters and they are irregular in their positions with various color options.
19 Jun 2010