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reCAPTCHA v2 is a new version of reCAPTCHA. Instead of entering text users can now use a single click to confirm they are not a robot.
reCAPTCHA is a free CAPTCHA service (http://www.google.com/recaptcha) that helps protect your site against spam, malicious registrations and other forms of attacks where computers try to disguise themselves as a human. reCAPTCHA is currently one of the best ways to protect online forms from spammers.