Duplicate content have always been an obstacles for webmasters while going for search engine optimization. Many of the webmasters got their site penalized by the search engines for using duplicate content in their website. The main case of duplicate content arises when multiple URLs on the same domain pointed to the same content. This issue mainly arises in dynamic and CMS driven sites and the webmasters really live with the fear of being penalized by the search engines. The case arises when more than a single URL on the same website points to the same content under certain conditions. Consider pages in a CMS driven web site http://www.yoursite.com/products.php?item=woodchairs&category=chairs and http://www.yoursite.com/product.php?item=woodchairs&trackingid=3254&sessionid=7184 which points to the same content at http://www.yoursite.com/products.php?item=woodchairs

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