A CAPTCHA is a type of challenge-response test used in computing to ensure that the response is not generated by a computer. The main intention of CHPTCHA turn out to prevent automated computer program which also called as spam bots. The nature of spam bots is to just submit spam content all over the web where they can perform.
In this method a server sends request to a user for a test that can only be understandable by a human rather than any other automated scripts. The server can develop and evaluate that test exclusively. Apart from server other computers are inefficient to solve the CAPTCHA.













