World's major search engines-search engine technology

Why do we think the following services are the main? Because they are either very famous or widely used.

For website managers, ranking on these famous search engines is crucial, because it may bring endless traffic to their websites.

For information searchers, these well-known and commercial search engines can query more reliable results. They are well maintained and updated frequently, and can keep up with the rapid development of the entire network.

Not all of the following are the search engines of the entire crawl network that we call "true sense. For example, both Yahoo and Open Directory manually edit the "category Directory" of the content ". In fact, the following 22 major services provide two types of information: Search and classification, although each has its own focus.


1. AOL Search
Http://search.aol.com/
Through AOL Search, online users of the United States can Search the entire network and AOL's own information content from one place. The "external" version listed above does not include AOL content. Their classification directories and site information come from Open Directory (see below). Inktomi (see below) provides the machine search results (crawler-based results ), fill the category directory. Before the release of AOL Search in October 1999, AOL used the AOL NetFind supported by Excite.

2. AltaVista
Http://www.altavista.com/
Based on the number of retrieved pages, AltaVista has always been one of the largest search engines on the Internet. Its comprehensive coverage and various advanced search commands make it one of the favorites of online searchers. It also develops many features for beginners, such as "Ask AltaVista"-from Ask Jeeves (see below ). AltaVista uses Open Directory. AltaVista started operation in December 1995 and was initially owned by Digital. After Digital was purchased by Compaq in 1998, AltaVista was owned by Compaq and then became an independent company, which is now under the control of the CMGI group.

3. Ask Jeeves
Http://www.askjeeves.com/
Ask Jeeves is a kind of manual search service. It aims to point to a specific page to answer your question. If it does not find relevant answers in its own database, it will provide pages found from other search engines. The service started its beta test in middle April 1997 and started its operation in June 1, 1997. The results of Ask Jeeves also appear in AltaVista (see above ).

4. Direct Hit
Http://www.directhit.com/