CAPTCHA - CAPTCHA (Completely Automated Public Turing Test to tell Computers and Humans Apart) is a program that generates a graphic with a distorted string of alphanumeric characters that a human can type into a form field but a computer-generated program cannot read and interpret. This is a splendid and low/no cost way to test whether a contributor to a site is indeed human.

CAPTCHA does not ensure that the human is a nice person that will contribute in a positive way to the site, but it at least protects the site from automated programs built for malicious intentions.

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