A web directory is a directory on the World Wide Web. It specializes in linking to other web sites and categorizing those links. Web directories often allow site owners to submit their site for inclusion, and have human editors review submissions for fitness. A web directory is not a search engine, and does not display web pages based on keywords, instead listing web pages in convenient categories and subcategories. Well-known web directories include the Yahoo! Directory, LookSmart, and the Open Directory Project (ODP). ODP is an important player in the directory...