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Search Engine Optimization

Roger Gonzales

Human powered directories

These directories compile listings of websites into specific industry and subject categories and they usually carry a short description about the website. Inclusion in directories is a human task and requires submission to the directory producers.

 Visitors and researchers over the net quite often use these directories to locate relevant sites and information sources. Thus directories assist in structured search.

Another important reason is that crawler engines quite often find websites to crawl through their listing and links in directories. Yahoo and The Open Directory are amongst the largest and most well known directories.

LookSmart is a directory that provides results to partner sites such as MSN Search, Excite and others. Lycos is an example of a site that pioneered the search engine but shifted to the Directory model depending on AlltheWeb.com for its listings.

Hybrid Search Engines are both crawler based as well as human powered. In plain words, these search engines have two sets of listings based on both the mechanisms mentioned above.

The best example of hybrid search engines is Yahoo, which has got a human powered directory as well as a Search toolbar administered by Google. Although, such engines provide both listings they are generally dominated by one of the two mechanisms. Yahoo is known more for its directory rather than crawler based search engine.

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How do Search Engines rank web pages

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