Links are a large part of the Web occurrence and are essential to websites. Search engines can find out a lot about a site based on looking at links. Search engine spiders crawl at both the site itself as well as the links within sites. Links provide two purposes online. First, they rapidly and easily link users to different and valuable information based on topic. Users can decide to click on links if they desire to in order to find out more information. On the other hand, links act as a popularity index of all sites online. Visualize the number of links to these pages that exists. The more popular a site, the more links there will be to that site on other sites.