Captcha

WOW 55 - Captcha

      Today we shall see what is meant by Captcha. If you have seen an image as shown below, it means that you know what a Captcha is.

      The purpose of Captcha is to avoid spam. In the picture above, the words "inget" is a captcha. The official definition of Captcha: "A CAPTCHA is a program that protects websites against bots by generating and grading tests that humans can pass but current computer programs cannot."

      The term "CAPTCHA" (based upon the word capture) was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper (all of Carnegie Mellon University), and John Langford (then of IBM). It is a contrived acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart." 

      Hope this information helps. To visit CAPTCHA's official site, follow this link: http://tinyurl.com/3pkrd. Here you can learn how to add CAPTCHA to your own site.

Danish :)