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How Yahoo Search Engine Works

Posted by Mohsin On 6/07/2012 12:18:00 AM No comments

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 crawler-based listings for its main results. These came from Google until February 2004. Now, Yahoo uses its own search technology. Learn more in this recent review from our SearchDay newsletter, which also provides some updated submission details.
In addition to excellent search results, you can use tabs above the search box on the Yahoo home page to seek images, Yellow Page listings or use Yahoo's excellent shopping search engine. Or visit the Yahoo Search home page, where even more specialized search options are offered.
The Yahoo Directory still survives. You'll notice "category" links below some of the sites lists in response to a keyword search. 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 links ("Related Directory Categories") and "Directory Results," 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. Yahoo's content acquisition program also offers paid inclusion, where sites can also pay to be included in Yahoo's crawler-based results. This doesn't guarantee ranking, Yahoo promises. The CAP program also bring in content from non-profit organizations for free.
Like Google, Yahoo sells paid placement advertising links that appear on its own site and which are distributed to others. Yahoo purchased Overture in October 2003.
Overture was formerly called GoTo until late 2001. More about it can be found on the Paid Listings Search Engines page. Overture purchased AllTheWeb in March 2003 and acquired AltaVista  in April 2003. Now Yahoo owns these, gained as from its purchase of Overture.
Technology AltaVista and AllTheWeb was combined with that of Inktomi, a crawler-based search engine that grew out UC Berkeley and then launched as its own company in 1996, to make the current Yahoo crawler. Yahoo purchased Inktomi in March 2003.
Getting Listed: Read the Submitting To Yahoo section of Search Engine Watch's Essentials Of Search Engine Submission guide for more information on appearing in Yahoo's own editorial results. Read the Overture section of Search Engine Watch's Essentials Of Search Engine Submission guide for more information on Overture's paid listings program.
Search Engine Watch members have access to the How Yahoo Works section of the web site, which provides in-depth coverage of how Yahoo gathers listings. The  Overture Works page, which provides in-depth coverage of how cost-per-click ads can be placed with Overture.

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