What is CAPTCHA?

by praveen 2009-12-03 12:42:02

CAPTCHA - Completely Automated Public Turing test to tell Computers & Human Apart.

How Captcha is used?
Captcha is used as a image recognition tool to get rid of spammers and robot(bot). Only the human can do these image recognition and robots cant recognise these images. So this type of human authentication becomes necessary for form submission pages.

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