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A directory must not only be a storehouse of facts, but also a means of giving an opportunity to everyone whose stock-in-trade is information or concepts for placing his knowledge at the disposal of others. This it does by arranging its contents in such a manner that each individual item can be reached easily and quickly by anyone interested in a specific subject.

Directory mechanic (autos) are based on a particular keyword or query. They could be with Google, Bing, and Yahoo search engines depending on the type you decide to acquire in terms of marketing objectives.