Most webmasters are guilty of including a link in a link directory. Link directories include websites that just list your site with a brief description and a link to your site. Some link directories let you specify keyword anchor text.nnThe link directory owner tries to boost his own PR, so yourPageRankis in turn increased. The whole process is a link scheme and against Google's guidelines. You want to remove these links or place them in a disavow file in Webmaster Tools.