Web crawler

A Web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web and that is typically operated by search engines for the purpose of Web indexing (web spidering). Web search engines and some other websites use Web crawling or spidering software to update their web content or indices of other sites' web content. Web crawlers copy pages for processing by a search engine, which indexes the downloaded pages so that users can search more efficiently.

Comment: enA Web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web and that is typically operated by search engines for the purpose of Web indexing (web spidering). Web search engines and some other websites use Web crawling or spidering software to update their web content or indices of other sites' web content. Web crawlers copy pages for processing by a search engine, which indexes the downloaded pages so that users can search more efficiently.
Depiction
DifferentFrom: Spider web
Has abstract: enA Web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web and that is typically operated by search engines for the purpose of Web indexing (web spidering). Web search engines and some other websites use Web crawling or spidering software to update their web content or indices of other sites' web content. Web crawlers copy pages for processing by a search engine, which indexes the downloaded pages so that users can search more efficiently. Crawlers consume resources on visited systems and often visit sites unprompted. Issues of schedule, load, and "politeness" come into play when large collections of pages are accessed. Mechanisms exist for public sites not wishing to be crawled to make this known to the crawling agent. For example, including a <a href="/wiki/Robots.txt" class="mw-redirect" title="Robots.txt">robots.txt</a> file can request bots to index only parts of a website, or nothing at all. The number of Internet pages is extremely large; even the largest crawlers fall short of making a complete index. For this reason, search engines struggled to give relevant search results in the early years of the World Wide Web, before 2000. Today, relevant results are given almost instantly. Crawlers can validate hyperlinks and HTML code. They can also be used for web scraping and data-driven programming.
Is primary topic of: Web crawler
Label: enWeb crawler
Link from a Wikipage to an external page: oak.cs.ucla.edu/~cho/research/crawl.html; www.wiley.com/legacy/compbooks/sonnenreich/history.html; code.google.com/p/wivet/; www.blogingguru.com/what-technology-do-search-engines-use-to-crawl-websites-google/; www.slideshare.net/denshe/icwe13-tutorial-webcrawling; www.slideshare.net/denshe/intelligent-crawling-shestakovwiiat13; llama.org/hamster/monkey/page.html%3C/nowiki%3E,
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SameAs: 4796298-7; 4Fc54; Arama robotu; Araña web; Aranya web; Crawler; Hakurobotti; Interneto robotas; Keresőrobot; m.08220; Mx4rv3R5vZwpEbGdrcN5Y29ycA; Perangkak web; Q45842; Rastreador web; Robot d'indexation; Robot de căutare; Robot internetowy; Spider; Spindel (internet); Søkerobot; Søkerobot; Veb-popisivač; Webcrawler; Webcrawler; Web crawler; Web crawler; Web crawler; Web crawler; Webkruiper; Web pauk; Ymgripiwr gwe; Ανιχνευτής ιστού; Поисковый робот; Пошуковий робот; Որոնողական ռոբոտ; זחלן רשת; خزنده وب; زاحف الشبكة; வலை ஊர்தி; เว็บครอว์เลอร์; クローラ; 網路爬蟲; 웹 크롤러
Subject: Category:Internet search algorithms; Category:Search engine software; Category:Web crawlers
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WikiPageLength: 53855
Wikipage page ID: 33120
Wikipage revision ID: 1124235168
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