A web directory or link directory is a directory on the World Wide Web. It specializes in linking to other web sites and categorizing those links.A web directory is not a search engine and does not display lists of web pages based on keywords; instead, it lists web sites by category and subcategory. Most web directory entries are also not found by web crawlers but by humans.[1] The categorization is usually based on the whole web site rather than one page or a set of keywords,