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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.[1]
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, and sites are often limited to inclusion in only a few categories. Web directories
often allow site owners to directly submit their site for inclusion, and have editors review submissions for
fitness.
Most of the directories are very general in scope and list websites across a wide range of categories,
regions and languages. But there are also some niche directories which focus on restricted regions,
single languages, or specialist sectors. One type of niche directory with a large number of sites in
existence, is the shopping directory for example. Shopping directories specialize in the listing of retail
e-commerce sites.
Examples of well known, general, web directories are Yahoo! Directory and the Open Directory Project
(ODP). ODP is significant due to its extensive categorization and large number of listings and its free
availability for use by other directories and search engines.[2]
However, a debate over the quality of directories and databases still continues, as search engines use
ODP's content without real integration, and some experiment using clustering. There have been many
attempts to make directory development easier, such as using automated submission of related links by
script, or any number of available PHP portals and programs. Recently, social software techniques have
spawned new efforts of categorization, with Amazon.com adding tagging to their product pages.