Today, Captcha are used to prevent automated postings to blogs or forums, to stop poll spamming, to protect the information stored in online banking sites, etc.
This Captcha has an essential functionality to avoid lots-and lots of spams on Joomla based websites. In this product, you can define your own, a set of rules to display the Captcha on your website. Here we are doing this by maintaining a three types of list –Black List, White List and then Captcha Manager. All these lists have different different significance.