Type the Word You See
In this early CAPTCHA example from Carnegie Mellon, a random word is camoflaged, and users are asked to type what they see. (Image courtesy of Carnegie Mellon School of Computer Science, www.captcha.net)
More Obtuse, More Random
CAPTCHAs are increasingly more distorted in order to fool the bots, and real words have given way to random letters and digits. However, just like virus writers, who learn to code their programs more effectively, so do the bot writers... a fun-loving, creative bunch.
Learn more about CAPTCHA