What is CAPTCHA images?
Posted by lampinterview on May 7, 2008
CAPTCHA will generate an image containing string of numbers and letters. this is to prevent spammers. So many programmers can create curl script which attach your form and fill junk data and send mail to you. Using bots which can fill forms automatically. If you use captcha then bots will not identify the string or numbers. By entering the numbers and letters from the image in the validation field, the application can be assured that this is not spam.
