Directories, another type of search system, differ from search engines. While search engines read and therefore contain information from web pages, directories contain information about websites. By far the most important directories are those owned by the Open Directory Project (www.dmoz.org) and Yahoo! (dir.yahoo.com). Specialised directories can also play a particularly important role, depending on the nature of your site. Yellow Pages sites tend to generate local searches, so good news if you’ve a local business, but they’re not free – actually they're expensive.
That directories categorise information about websites is necessarily limiting. For one thing, keywords typed into search boxes throw up sites according to the category they’re listed under and which contain those keywords in their title or description. Directories, therefore, overlook huge bodies of relevant information contained within websites.
Yet directories are important. Google, the most important search system, builds its own index, but gets its directory results from the Open Directory Project (the Open Directory Project also feeds hundreds of other sites). Also, a directory presence may well help your site rate better for some searches. Search engines probably – at least in part – use trusted directories to identify a website’s subject.
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