Web search engines

(redirected from Web search engine)
Also found in: Wikipedia.

Web search engines

A website that maintains an index and short summaries of billions of pages on the Web, Google being the world's largest. China's Baidu, Microsoft's Bing and Yahoo follow in size.

Most search engine sites are free and paid for by ads. Yahoo was the first to gain worldwide attention. Yahoo was originally known as a "directory" rather than a search engine, because it indexed much of its content by human observation. However, as Web content grew exponentially, it became impossible to index everything manually.

Web Spiders, Bots and Crawlers
Most indexing is done automatically by Web "spiders" or "bots," which are programs that "crawl" the Web around the clock looking for all the pages they can find. By following the links from one page to another, they scour billions of pages and summarize them in massive databases, which is what you query when you do a search.

"Metasearch" engines search other search engines and bring you results as if you went to each of them independently (see below).

The Deep Web
An enormous amount of content that websites offer resides in databases that are not exposed to the search engines like ordinary HTML pages. This "deep Web," which is much larger than the public Web is accessible only from the website, which may require membership or a paid subscription.

The Portal
Many search engine sites evolved into a portal. Instead of offering content only from other websites, they have their own content and features such as free email, chat rooms and shopping. See portal, Web white pages, Web yellow pages and information broker.

Search Engine Sites

Following are popular sites for searching any topic. If you do not find what you want at one site, try another, even if you use a metasearch engine. Spiders do not always find the same information at the same time.

  www.aol.com (portal)


  www.baidu.com (Chinese)







  www.yahoo.com (portal)

  www.mamma.com (coupons)

  www.dogpile.com (metasearch)

  www.search.com (metasearch)

  www.wolframalpha.com (computational)
References in periodicals archive ?
Thus, this book on web search engine research is a significant tool to activate the thrust areas of research in the web world.
operator of South Korea's most visited Web search engine, said Wednesday it will roll out more refined features such as a real time search function for its microblogging service in a move to capitalize on a booming trend for social networking services.
Exalead, a provider of search software for business and the web, announced on Wednesday (28 November) that it has released an optimised version of its web search engine that is designed for use with the Apple iPhone.
Lemur Consulting, a search engine company, is part of a consortium that has been awarded a UK Department of Trade and Industry grant of GBP815,000 to build a next generation web search engine.
Without further qualification, search engine usually refers to a Web search engine, which searches for information on the public Web.
Web Search Engine (parts 1, 2, and 3) ," "Draw and Tell: Children as Designers of Web Interfaces," and "Differences and Similarities in Information Seeking: Children and Adults as Web Users.
goes into battle with the Great God Google for leadership of the Web search engine field, the need for positive differentiation of its service has turned Yahoo
the world's premier web search engine in its negotiations for additional space at 1440 Broadway.
Other topics will include web search engine systems and cross-language systems.
Scirus, the web search engine for scientific information, gives users access to over 167 million pages of scientific information on the web, including author homepages, university sites, corporate information a variety of other sites.
com is a web search engine that, with its visual approach to search and intuitive user interface, provides users with a unique and more efficient way to view and interact with search results.