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. 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 one or two categories.

Web directories often allow site owners to directly submit their site for inclusion, and have editors review submissions for fitness. RSS directories are similar to web directories, but contain collections of RSS feeds, instead of links to web sites.

BusDr.com is an online web directory offering business guide, business directory, advertising directory, aerospace directory, defense directory, agriculture directory, airlines directory, automotive directory, chemicals directory, computers directory, electronics directory, energy directory, utilities directory, financial directory, services directory, healthcare directory, industrial directory, internet directory, pharmaceuticals directory, real estate directory, construction directory, transportation directory, travel directory and more.

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