Yahoo Search Engine and Directory

Yahoo! was created as a hand-picked directory of Web sites.

 Over the past decade, however, the Yahoo! directory has become a less and less important part of the Yahoo! pantheon of services to the point where many users don’t even know the directory exists.

After all, if you use the search box on the Yahoo! home page which Yahoo! obviously wants you to do you pass over the directory entirely.
That’s too bad, because the Yahoo! directory is actually a pretty good assem­ blage of what’s out there on the Web. It’s also arguably the easiest search site for Web surfers to use.

It all boils down to the basic difference between a directory and a search index.
You see, there are two approaches to organizing all the information on the
World Wide Web.

 One approach is to use a special type of software program
(called a spider or crawler) to roam the Web automatically, feeding what it finds
back to a massive bank of computers.

 These computers hold indices of the Web in some cases, entire Web pages are indexed; in other cases, only the titles and important words on a page are indexed. This approach is the one taken by the big search engines, such as Google, AltaVista, and HotBot and  by Yahoo!’s Web Search feature

The other approach the one taken by the Yahoo! directory is to have actual human beings physically look at each Web page and stick each one into a hand-picked category. After you get enough Web pages collected, you have something called a directory.

Unlike a search engine, a directory doesn’t search the entire Web in fact, a directory catalogs only a very small part of the Web. But a directory is very organized, and very easy to use, and lots and lots of people use Web directories (such as Yahoo!) every day.

Of course, that’s not to say that the Yahoo! directory is perfect. Far from it. For starters, it’s small only 2 million pages, versus 3 billion or so in Yahoo!’s Google­ supplied Web Search index. (That means that Yahoo!’s directory content repre­ sents less than 1⁄10  of 1 percent of the total number of pages currently published on the Web—not very comprehensive at all.)