CAPTCHA (Completely Automated Public Turing test to Tell Computers and Humans Apart) is a security check to distinguish between humans and computers. Computers or bots are not capable of solving a Captcha problem. Captcha is automatically generated with a random string. Generally, Captcha is generated by using an image with text/numbers or combination of both. A human has to enter the correct Captcha code to pass through the security check. Captcha technology is used mostly to block spammers who try to sign up and hack information from Web sites, blogs, or forums.
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