CAPTCHA and ReCAPTCHA

Hello friends,today i'll tell you about two most important words that are commonly use when you fill any registration form in the internet.


Short for Completely Automated Public Turing test to tell Computers and Humans Apart, CAPTCHA is a protection that identifies humans from computers. A commonly used CAPTCHA is an image that is distorted that contains text that is easy for humans to read, but difficult or impossible for computers to read. 



A CAPTCHA that not only helps protect a site from bots or other sctipts but also helps read books. With a ReCAPTCHA one word is generated by the script and another word is a scanned word that an OCR program didn't understand. The idea is that if a user successfully understands one of the words that it's more than likely that the other word is also correct. On September 16, 2009, Google announced it was acquiring ReCAPTCHA.


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