Answer: A security system that blocks robots.
reCAPTCHA is the improved version of CAPTCHA. CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart. This is a puzzle in letters or with images that needs to be deciphered. Only humans can solve this. Robots can unnecessarily encumber a website or decrypt passwords by trying this thousands of times. The reCAPTCHA measure prevents this type of attack.
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