These days, all of the major search sites accept search terms. But a few also supply a directory of categories, an index of sorts, that you can browse to locate links to pages related to a particular topic. Tools that feature such directories include Yahoo!, Excite, and Infoseek.
Tip
Directory browsing is something of a sideline for other search sites, but it's the bread and butter of Yahoo!. When you want to search in this way, Yahoo! is almost always your best starting point.