searchengine-yr4

8/11/2019 SearchEngine-yr4

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WEB SEARCH ENGINE

By:Abd Rashid Bin Hj Shafie

Penyelaras BestariSMK Gunung Rapat, Ipoh

A Web search engineis a search engine designed to search for information on the World

Wide Web (WWW). Information may consist of web pages, images, information andother types of files. Some search engines also mine data available in news books,

databases, or open directories. Unlike Web directories, which are maintained by hman

editors, search engines operate algorithmically or are a mi!tre of algorithmic and hmaninpt. "he e!amples of web search engines are#

$. Ask %eeves

&. 'oogle


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. ycos


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*. Infoseek

+. ahoo- Search


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. /owerset (&001)

Timeline

2ote# 3anch3 refers only to web

availability of original crawl4based

web search engine reslts. 5or fll4list# ist of search engines

Year Engine Event

$66 Aliweb anch

$66*

Web7rawler anch

Infoseek anch

ycos anch

$66+

Alta8ista anch (part of 9:7)

;agellan anch ("he ;c


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$666

AlltheWeb anch

'enie


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cached page always holds the actal search te!t since it is the one that was actally

inde!ed, so it can be very sefl when the content of the crrent page has been pdated

and the search terms are no longer in it. "his problem might be considered to be a mildform of linkrot, and 'oogleFs handling of it increasessabilityby satisfying ser

e!pectationsthat the search terms will be on the retrned webpage. "his satisfies the

principle of least astonishmentsince the ser normally e!pects the search terms to be onthe retrned pages. Increased search relevance makes these cached pages very sefl,

even beyond the fact that they may contain data that may no longer be available

elsewhere.

When a ser enters a Eeryinto a search engine (typically by sing key words), theengine e!amines its inde!and provides a listing of best4matching web pages according to

its criteria, sally with a short smmary containing the docmentFs title and sometimes

parts of the te!t. ;ost search engines spport the se of theboolean operatorsA29, =Gand 2=" to frther specify the search Eery. Some search engines provide an advanced

featre calledpro!imity searchwhich allows sers to define the distance between

keywords.

"he seflness of a search engine depends on therelevanceof the result setit gives back.While there may be millions of webpages that inclde a particlar word or phrase, some

pages may be more relevant, poplar, or athoritative than others. ;ost search engines

employ methods to rankthe reslts to provide the 3best3 reslts first. >ow a searchengine decides which pages are the best matches, and what order the reslts shold be

shown in, varies widely from one engine to another. "he methods also change over time

as Internet sage changes and new techniEes evolve.

;ost Web search engines are commercial ventres spported by advertisingrevene and,

as a reslt, some employ the practice of allowing advertisers topay money to have theirlistings rankedhigher in search reslts. "hose search engines which do not accept money

for their search engine reslts make money byrnning search related adsalongside thereglar search engine reslts. "he search engines make money every time someone clicks

on one of these ads.

Gevene in the web search portals indstry is proBected to grow in &001 by $.* percent,

with broadband connections e!pected to rise by $+.$ percent. ?etween &001 and &0$&,indstry revene is proBected to rise by + percent as Internet penetration still has some

way to go to reach fll satration in American hoseholds. 5rthermore, broadband

services are proBected to accont for an ever increasing share
http://en.wikipedia.org/wiki/Linkrothttp://en.wikipedia.org/wiki/Usabilityhttp://en.wikipedia.org/wiki/Usabilityhttp://en.wikipedia.org/wiki/User_expectationshttp://en.wikipedia.org/wiki/User_expectationshttp://en.wikipedia.org/wiki/Principle_of_least_astonishmenthttp://en.wikipedia.org/wiki/Web_search_queryhttp://en.wikipedia.org/wiki/Web_search_queryhttp://en.wikipedia.org/wiki/Keyword_(Internet_search)http://en.wikipedia.org/wiki/Inverted_indexhttp://en.wikipedia.org/wiki/Inverted_indexhttp://en.wikipedia.org/wiki/Boolean_operatorshttp://en.wikipedia.org/wiki/Web_search_queryhttp://en.wikipedia.org/wiki/Proximity_search_(text)http://en.wikipedia.org/wiki/Relevance_(information_retrieval)http://en.wikipedia.org/wiki/Relevance_(information_retrieval)http://en.wikipedia.org/wiki/Rank_orderhttp://en.wikipedia.org/wiki/Advertisinghttp://en.wikipedia.org/wiki/Paid_inclusionhttp://en.wikipedia.org/wiki/Paid_inclusionhttp://en.wikipedia.org/wiki/Paid_inclusionhttp://en.wikipedia.org/wiki/Contextual_advertisinghttp://en.wikipedia.org/wiki/Contextual_advertisinghttp://en.wikipedia.org/wiki/Contextual_advertisinghttp://en.wikipedia.org/wiki/Linkrothttp://en.wikipedia.org/wiki/Usabilityhttp://en.wikipedia.org/wiki/User_expectationshttp://en.wikipedia.org/wiki/User_expectationshttp://en.wikipedia.org/wiki/Principle_of_least_astonishmenthttp://en.wikipedia.org/wiki/Web_search_queryhttp://en.wikipedia.org/wiki/Keyword_(Internet_search)http://en.wikipedia.org/wiki/Inverted_indexhttp://en.wikipedia.org/wiki/Boolean_operatorshttp://en.wikipedia.org/wiki/Web_search_queryhttp://en.wikipedia.org/wiki/Proximity_search_(text)http://en.wikipedia.org/wiki/Relevance_(information_retrieval)http://en.wikipedia.org/wiki/Rank_orderhttp://en.wikipedia.org/wiki/Advertisinghttp://en.wikipedia.org/wiki/Paid_inclusionhttp://en.wikipedia.org/wiki/Paid_inclusionhttp://en.wikipedia.org/wiki/Contextual_advertising

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