[Update] What is CAPTCHA?

A "CAPTCHA" is script used in computing as an attempt to ensure that the response is generated by a person. It looks like images to stop automated submissions.
 Captcha stands for "Completely Automated Public Turing test to tell Computers and Humans Apart".

 A Captcha is a type of challenge-response test most often placed within web forms to determine whether the user is human. This script generates images which contain security codes used for protecting a form from spam bots.
 

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