Captcha is an acronym for Completely Automated Public Turing test to differentiate between computers and humans. A Captcha Security Code is an image of letters that a person must type in to match the Captcha image they see. It is a type of challenge response test used in computing to ensure that the response is not generated by a computer. This code was created to stop automated computer spam robots from filling out forms and harvesting email addresses and then sending out spam emails. Only a human can type out a code he sees correctly, an automated computer programme cannot.
Tags Automated computer programme Captcha Captcha image Captcha Security Code Completely Automated Public Turing test Computers and humans Harvesting email addresses Sending out spam emails To stop automated computer spam robots