CAPTCHA Project

Does anybody know about CAPTCHA?
Have you ever thought why blogger recommend word verification?

Here is a brief introduction .It is a program that can generate and grade tests that:
Most humans can pass.
Current computer programs can't pass.
You may have tried many Free Email Services ,at the end of registration you are asked to enter a distored words that can be recognized by human only,what it helps in is that it prevents bots to automatically register .
For more information and some interesting incidents CAPTCHA project visit:http://www.captcha.net/

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