Web directories : A web directory or link directory is on the World Wide Web. It specializes in linking to other web sites and categorizing those links. Thus, in web directory, web sites are categorized by subject.
A web directory web sites by category and subcategory. The categorization is usually based on the whole web site rather than one page or a set of keywords, and sites are often limited to inclusion in only a few categories.
For example, Yahoo web directory includes categories for Arts & Humanities, Business & Economy, Computer & Internet, Recreation & Sports, Education & others. Each of these major categories contains many sub categories. For example, if we click on Recreation & Sports category, we can find Sports, Games, Travels, Outdoors and many other sub-categories.