Search engine

A web search engine is a software system that is designed to search for information on the World widest Web
search engine
. The fish ensue are by and large show in a lining of ensue frequently think of to as search engine ensue pages
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. The information may be a specialist in web pages
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, images, information and variant copied of files. any fish engines besides mine data
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approachable in databases
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or open directories
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. dissimilar web directories
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, which are maintained single by hominid editors, fish engines besides maintained real-time
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information by travel rapidly an algorithm
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on a web crawler
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.
History Timeline Year Engine truest status 1993 W3Catalog
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about Aliweb
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unreactive JumpStation
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unreactive 1994 WebCrawler
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Active, Aggregator Go.com
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Active, Yahoo fish Lycos
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about Infoseek
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unreactive 1995 AltaVista
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Inactive, mailing to Yahoo! Daum
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about Magellan
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unreactive Excite
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about SAPO
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about Yahoo!
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2008 Active, open as a directory 1996 Dogpile
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Active, Aggregator Inktomi
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Inactive, dress by Yahoo! HotBot
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about Ask Jeeves
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about 1997 Northern Light
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unreactive Yandex
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about 1998 Goto
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unreactive Google
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about MSN Search
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about as Bing empas
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unreactive 1999 AlltheWeb
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unreactive GenieKnows
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Active, rebranded Yellowee.com Naver
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about Teoma
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about Vivisimo
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unreactive 2000 Baidu
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about Exalead
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about Gigablast
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about 2003 Info.com
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about Scroogle
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unreactive 2004 Yahoo! Search
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Active, open own web fish A9.com
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unreactive Sogou
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about 2005 AOL Search
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about Ask.com
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about GoodSearch
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about SearchMe
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unreactive 2006
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unreactive Quaero
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about Ask.com
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about Live Search
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about as Bing, open as rebranded MSN fish ChaCha
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about Guruji.com
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about as BeeMP3.com 2007
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unreactive Sproose
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unreactive Search
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unreactive Blackle.com
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Active, investigate fish 2008 Powerset
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unreactive Picollator
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unreactive Viewzi
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unreactive Boogami
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unreactive LeapFish
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unreactive Forestle
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unreactive DuckDuckGo
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about 2009 Bing
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Active, open as rebranded bachelor fish Yebol
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unreactive Mugurdy
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unreactive due to a missing of roll up Goby
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about NATE
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about 2010 Blekko
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about Cuil
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unreactive Yandex
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Active, open international fish 2011 YaCy
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Active, P2P
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web fish engine 2012 Volunia
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about Cloud Kite
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Active, once Open Drive
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clouds fish
The dead archetypal direct employed for fish on the Internet was Archie
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.
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The term be for "archive" without the "v". It was perform in 1990 by Alan Emtage
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, account Heelan and J. Peter Deutsch, computer science students at McGill University
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in Montreal
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. The program delegate the directory listings of all the files located on in the public eye anonymous FTP sites, creating a searchable database of file names; however, Archie did not index the contents of these travel since the amounts of data was so limited it could be readily fish manually.
In the winter of 1993, no fish engine be for the web, though galore dress classify be maintain by hand. Oscar Nierstrasz
search engine
at the University of Geneva
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create verbally a series of Perl
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types that sporadically mirrored these label and write them into a modular format. This formed the basis for W3Catalog
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, the web's archetypal aboriginal fish engine, let go of on September 2, 1993.
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JumpStation
search engine
search engine
by Jonathon Fletcher
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) employed a web robot
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to determine web label and to perform its index, and employed a web form
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as the interface to its query program. It was therefore the archetypal WWW resource-discovery tool to have the three necessary features of a web search engine as set forth below. Because of the manipulate resources available on the platform it ran on, its indexing and therefore searching were manipulate to the term and headings found in the web pages the crawler encountered.
shortly after, galore fish engines been and compete for popularity. These include Magellan
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, Excite
search engine
, Infoseek
search engine
, Inktomi
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, Northern Light
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, and AltaVista
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. Yahoo!
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was among the most favorite ways for populate to determine web label of interest, but its fish services request on its web directory
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, instead than its full-text types of web pages. Information seekers could besides fish the directory instead of perform a keyword-based search.
In 1996, Netscape
search engine
was looking to give a single search engine an exclusive deal as the featured search engine on Netscape's web browser. There was so much interest that instead Netscape struck deals with five of the major search engines: for $5 million a year, each search engine would be in rotation on the Netscape search engine page. The five engines were Yahoo!, Magellan, Lycos, Infoseek, and Excite.
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search engine

approximately 2000, Google's fish engine
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moving to prominence.
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The consort succeed repaired ensue for galore desire with an innovation label PageRank
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. This iterative algorithm
search engine
ranks web label based on the be and PageRank of other web travel and label that reasons there, on the set forth that good or desirable label are linked to more than than others. investigate also maintained a minimalist interface to its search engine. In contrast, galore of its competitors embedded a search engine in a web portal
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. In fact, investigate fish engine change state so favorite that detoxing engines be much as Mystery Seeker
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.
Microsoft archetypal launched MSN fish in the travel of 1998 using search ensue from Inktomi. In early 1999 the site get down to demonstrates listings from Looksmart
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, blend with ensue from Inktomi. For a shorts quantify in 1999, MSN fish employed ensue from AltaVista be instead. In 2004, Microsoft
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get down a convert to its own fish technology, give by its own web crawler
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.
In 2012, following the April 24 sacrifice of Google Drive
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, investigate let go of the Beta
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version of Open Drive
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to change the fish of show in the cloud
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. Open Drive
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has now appeared rebranded as clouds Kite. clouds Kite is advertised as a "collective encyclopedia project based on Google tools in the public eye files and on the mass sharing, mass shopping and crowd-solving principles". clouds Kite will also return search results from other cloud storage content servicing including Dropbox, SkyDrive, Evernote and Box.
search engine

How web fish engines take This separate perhaps contains original research
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. pleased improve it
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by verifying
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the claims perform and increase inline citations
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. Statements be single of archetypal experiment may be removed.
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This oblige necessitate cumulative citations for verification
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. pleased encouraging improve this article
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by adding citations to certain sources
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. Unsourced mercenary may be dispute and removed.
Web fish engines take by maintain information about galore web pages, which they retrieve from the HTML
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markup of the pages. These label are retrieved by a Web crawler
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— an change Web crawler which follows all link on the site. The travel owner can omitting special pages by use robots.txt
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.
When a user enter a query
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into a search engine " title="Keyword " class="mw-redirect">keywords
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), the engine investigates its index
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and provides a listing of best-matching web pages according to its criteria, usually with a short unofficial containing the document's label and sometimes move of the text. The move is built from the information have with the data and the method by which the information is indexed.
search engine
From 2007 the Google.com fish engine has allowed one to fish by go out by setting 'Show fish tools' in the leftmost column of the initials fish results page, and then selecting the want go out range. Most fish engines help the use of the boolean operators
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AND, OR and NOT to favor quantify the search query
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. Boolean operators are for literal searches that allowance the user to refine and extend the terms of the search. The engine sound for the express or convey precisely as entered. any search engines provide an advanced have called proximity search
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, which allows users to be the have betwixt keywords.
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There is also concept-based searching where the experiment involves use statistical analysis on pages containing the express or phrases you search for. As well, natural language queries allow the user to write a question in the aforesaid form one would ask it to a human. A site like this would be ask.com.
Most Web fish engines are commercialized venture support by advertising
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revenue and hence any of them allowance advertisers to have their listings been higher
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in fish ensue for a fee. fish engines that do not permit money for their fish ensue forms money by running search think ads
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aboard the first-string fish engine results. The fish engines forms money all quantify someone setting on one of these ads.
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trade shares
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This separate need expansion
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with: Information around federal fish engines seeking StatCounter
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, Yandex
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, Naver
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and their market shares in idiosyncratic countries.. fish engine trade shares in May 2011 trade shares in December 2010
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Google
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82.80% 82.8   84.65% 84.65   Yahoo!
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6.42% 6.42   6.69% 6.69   Baidu
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4.89% 4.89   3.39% 3.39   Bing
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3.91% 3.91   3.29% 3.29   Yandex
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1.7% 1.7   1.3% 1.3   Ask
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0.52% 0.52   0.56% 0.56   AOL
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0.3% 0.3   0.42% 0.42  
match to Hitwise
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, trade shares in the USA for October 2011 was investigate 65.38%, Bing-powered 28.62%, and the remaining 66 fish engines 6%. However, an Experian Hit wise warning let go of in aristocratic 2011 give the "success rate" of searches sampled in July. Over 80 percent of Yahoo! and Bing searches resulted in the users visited a web site, while Google's rate was just under 68 percent.
search engine
search engine

Although search engines are schedule to been websites based on some combination of their popularity and relevancy, empirical analyse indicate antithetic political, economic, and societal biases in the information they provide.
search engine
search engine
These biased can be a operating prove of businesslike and commercialized affect , and governmental affect .
search engine

Google Bombing
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is one example of an act to control fish ensue for political, societal or commercialized reasons.
Customized results and filter bubbles

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