What is CAPTCHA?
Captcha is the mechanism that you will have seen, whereby you're asked to enter some garbled text. The reason it's garbled is so that it will only be human readable, and will therefore stop a spam robot in it's tracks!
The word is derived from...
Completely Automated Public Turing test to tell Computers and Humans Apart.
I like to use recaptcha wherever possible, because they use your entries to help decypher old important documents that have been scanned and archived.
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