What is CAPTCHA?? Do u KNOW it ?

What is CAPTCHA??
 
Have you ever seen the distorted letters while signing up for many e-mail servicesor facebook, after completing the all steps of signing up process, a last step of the signup process is that there is a section of distorted letters which you have to type it again in the blank field given. This is what called CAPTCHA.

CAPTCHA stands for Completely Automated Public Turing Test To Tell Computers and human Apart. The CAPTCHA is used to verify that the user which is filling information or using service is a human or a computer. The human can easily pass this verification test but it is very hard for computer to solve this puzzle.

This verification process is used so that the spammers cant make hundreds of fake account with the help of a computer or bots.