In
this article I will explain what is CAPTCHA? How to use CAPTCHA code in ASP.NET
web application?
A
CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a challenge-response
system test designed to differentiate humans from automated
programs. A CAPTCHA differentiates between human and bot by setting some task that is easy for most humans to
perform but is more difficult and time-consuming for current bots to complete.

