Unlike search engines, most online directories list websites alphabetically instead of relying on search results. Visitors can scan or search the listings to easily find a site by its name and category. Directories are also managed by editors, not compiled by computers, which means their listings are often categorized more accurately than those in search engines.

A specialized directory that serves your niche business or industry can be an especially effective way to attract customers already seeking products and services like yours. Not only can a respected directory increase your site traffic, it can also raise your site's profile for search engines, which can in turn help boost your search engine ranking.

If you're a realtor, for example, you might seek a directory of real estate brokers, agents, builders, and resources, like Reals.com. Does your company specialize in green services? The Environment Directory might be glad to list your site.

You find specialized directories related to your industry with the help of search engines, but be sure to check resources closer to home, like industry-related magazines or newsletters that might mention or advertise a related directory. Ask your colleagues and customers for ideas, too.

Submitting your site won't take much time. Some directories may ask that your site meet certain requirements, or charge you a small listing fee. Be sure to carefully research the directory guidelines before submitting your site.