Wednesday, 6 February 2013
Captcha | Captcha Code | PHP Captcha
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A CAPTCHA is a type of challenge-response test used in computing as an attempt to ensure that the response is generated by a human being. In other words, CAPTCHA is a security mechanism that ensures visitor to your websites are human and are not automated bots clicking on your sites.
There are lot of paid captcha sites, but Google provide CAPTCHA services free. Just login to your Google account and visit the following URL:
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