Search engine Yahoo
http://www.yahoo.com

Launched in 1994, Yahoo is the web's oldest "directory," a place where human editors organize web sites into categories. However, in October 2002, Yahoo made a giant shift to using Google's crawler-based listings for its main results.
If Yahoo is now powered by Google, then why bother using it? For one thing, you might find that the way Yahoo "enhances" Google's listings with information from its own directory may make search results more readable. 

In addition, Yahoo's search results pages still show "Directory Category Matches." When offered, these will take you to a list of web sites that have been reviewed and approved by a human editor.

It's also possible to do a pure search of just the human-compiled Yahoo Directory, which is how the old or "classic" Yahoo used to work. To do this, search from the Yahoo Directory home page, as opposed to the regular Yahoo.com home page. Then you'll get both Directory Category Matches and "Directory Site Matches," which are the top web site matches drawn from all categories of the Yahoo Directory.
Sites pay a fee to be included in the Yahoo Directory's commercial listings, though they must meet editor approval before being accepted. Non-commercial content is accepted for free.
Consider Yahoo any time you think you might be well served by having a list of human-reviewed web sites. It's also a good choice for popular queries, since the category listings it provides may help you narrow in and refine your query. Doing a pure Yahoo Directory search also provides an unique human view of the web.

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