Directories, also known as Web indexes, allow you to look for information by categories, such as sports, current events, music, etc.  You can click main categories which will then take you to subcategories, and maybe even more subcategories.  Yahoo!, which is often confused as a search engine, is really a Web index/directory.  While it does let you do a search by typing in a keyword yourself, the sites that are included are submitted for approval rather than automatically included with a robot program.  Some directories are done by professional organizations, while others are done by commercial groups.  Using a directory done by librarians, teachers, and other experts who are qualified will usually increase your success in finding authentic and valuable information on the Web.

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