CAPTCHA is one of the spam blocking techniques. Click here to check the details of other spam blocking techniques.
A CAPTCHA is a type of word verification to ensure that the response is not machine generated.
The process usually involves server asking to enter user word displayed on the screen.
Ref - wikipedia
CAPTCHA in ASP.NET
http://www.codeproject.com/KB/aspnet/CaptchaImage.aspx
http://james.newtonking.com/archive/2006/05/29/Preventing-Spam-With-An-ASP.NET-CAPTCHA-Control.aspx
http://www.eggheadcafe.com/community/aspnet/2/10061743/how-to-develop-word-verif.aspx
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