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What Is reCAPTCHA?
A CAPTCHA is a program that can tell whether its user is a human or a computer. reCAPTCHA channels the human effort of solving these CAPTCHAs into "reading books".
A CAPTCHA that not only helps protect a site from bots or other scripts but also helps read books. With a ReCAPTCHA, one word is generated by the script and the other is a scanned word that an OCR program didn't understand. The idea is that if a user successfully understands one of the words it's more than likely that the other word is also correct.