CAPTCHA is designed to recognize the difference between a bot and human and sometimes even malicious software to provide the security to your system. If you want to prevent the entry of bots into your website then you can start using the CAPTCHA as it is the smartest way to stop it.
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Graham
Graham Bill has been a professional Web developer and has been assisting others to learn Web Design, HTML, CSS, PHP, ASP.net, VB.net, jQuery, JavaScripts, Ajax, jsp, XML, MySQL, SQL Server, SEO (Google, Bing, Yahoo) and especially on development Joomla Templates and WordPress Themes since 2009. Follow Graham' daily design links on Twitter or Facebook
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