Web search engines
Posted by The Bridge
Definition:
A web search engine is designed to search for information on the World Wide Web. The search results are usually presented in a list of results and are commonly called hits. The information may consist of web pages, images, information and other types of files. Some search engines also mine data available in databases or open directories. Unlike Web directories, which are maintained by human editors, search engines operate algorithmically or are a mixture of algorithmic and human input.
How web engines work:
There are three different algorithms that search engines can use:
The most important one is the index-based. Search engines that use this method read documents, look for search terms and lay on an index. The index could be used later and makes the search very fast.
Metasearch engines inquires some parallel working, index-based search engines and combine the invidual results. This process needs a lot of time and the results could be useless if the meta search engine use a bad index based engine.
The third one is the hybrid form. The have an own often very small index, and ask other search engines to combine the results. The quality is bad because they miss a detailed data base and they often fail with complex search terms.
Instructions to use Google effectively:
- Remember what you want to search, pictures, videos or pages in the web.
- Consider what the central terms in your question are. It has no sense to ask complete questions because Google will find less useful results.
- The most profitable search results are more often than not on the first page.
- Google does sort the founded pages after frequency of links. So the first results are only websites that people often use.
- If you did not find the desired results try the same thing with other searching terms nearby the topic.
Comparison of different web search engines:
Lycos Europe is a pan-European network of websites, offering services including communication tools, online communities, web search, e-commerce, web hosting, homepage building and Internet access. It is an independent corporation, sharing no corporate structure with Lycos, Inc. (USA), but Lycos Europe was formed as a joint-venture between Bertelsmann and Telefonica. On 26 November 2008, Lycos Europe announced that it was to shut down and sell its remaining assets.
Google Search or Google Web Search is a web search engine owned by Google Inc. and is the most-used search engine on the Web. Google receives several hundred million queries each day through its various services. The main purpose of Google Search is to hunt for text in web pages, as opposed to other data, such as with Google Image Search. Google search was originally developed by Larry Page and Sergey Brin in 1997.
Google Search provides more than 22 special features beyond the original word-search capability. These include synonyms, weather forecasts, time zones, stock quotes, maps, earthquake data, movie show times, airports, home listings, and sports scores. There are special features for numbers including prices, temperatures, money/unit conversions, calculations , package tracking, patents, area codes, and rudimentary language translation of displayed pages.
Yahoo! Inc. is an American public corporation headquartered in Sunnyvale, California, that provides Internet services worldwide. The company is perhaps best known for its web portal, search engine (Yahoo! Search), Yahoo! Directory, Yahoo! Mail, Yahoo! News, advertising, online mapping (Yahoo! Maps), video sharing (Yahoo! Video), and social media websites and services. JP Morgan put the company’s US market share for display ads at 17%, well ahead of No. 2 Microsoft at 11% and AOL at 7%.
Yahoo! was founded by Jerry Yang and David Filo in January 1994 and was incorporated on March 1, 1995. On January 13, 2009, Yahoo! appointed Carol Bartz, former executive chairperson of Autodesk, as its new chief executive officer and a member of the board of directors.
Source: http://en.wikipedia.org/wiki/Web_search_engine
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June 3rd, 2010 5:52 am
I really enjoyed this post, especially the “examples in this post” portion which made it really easy for me to SEE what you were talking about without even having to leave the article. Thanks
June 6th, 2010 7:07 pm
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June 23rd, 2010 3:05 am
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