captcha? A CAPTCHA is a program that can tell whether its user is
a human or a computer. You've probably seen them - colorful images with
distorted text at the bottom of Web registration forms. CAPTCHAs are used
by many websites to prevent abuse from "bots," or automated programs
usually written to generate spam. No computer program can read distorted
text as well as humans can, so bots cannot navigate sites protected by
CAPTCHAs. Learn more...