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=== Getting indexed ===
[[File:PageRanks-Example.svg|thumb|A simple illustration of the [[PageRank|Pagerank]] algorithm. Percentage shows the perceived importance.]]
The leading search engines, such as Google, Bing, [[Brave Search]] and Yahoo!, use [[Web crawler|crawlers]] to find pages for their algorithmic search results. Pages that are linked from other search engine-indexed pages do not need to be submitted because they are found automatically. The [[Yahoo! Directory]] and [[DMOZ]], two major directories which closed in 2014 and 2017 respectively, both required manual submission and human editorial review.<ref>{{cite web|url=http://searchenginewatch.com/showPage.html?page=2167881|title=Submitting To Directories: Yahoo & The Open Directory|date=March 12, 2007|access-date=May 15, 2007|publisher=[[Search Engine Watch]]|archive-url=https://web.archive.org/web/20070519052103/http://searchenginewatch.com/showPage.html?page=2167881|archive-date=May 19, 2007|df=mdy-all}}</ref> Google offers [[Google Webmaster Tools|Google Search Console]], for which an XML [[Sitemap]] feed can be created and submitted for free to ensure that all pages are found, especially pages that are not discoverable by automatically following links<ref>{{cite web|url=http://www.google.com/support/webmasters/bin/answer.py?answer=40318&topic=8514|title=What is a Sitemap file and why should I have one?|access-date=March 19, 2007|archive-date=July 1, 2007|archive-url=https://web.archive.org/web/20070701232719/http://www.google.com/support/webmasters/bin/answer.py?answer=40318&topic=8514|url-status=live}}</ref> in addition to their URL submission console.<ref>{{cite web |url=https://www.google.com/webmasters/tools/submit-url |title=Search Console - Crawl URL |access-date=2015-12-18 |archive-date=August 14, 2022 |archive-url=https://web.archive.org/web/20220814100500/https://accounts.google.com/_/bscframe |url-status=live }}</ref> Yahoo! formerly operated a paid submission service that guaranteed to crawl for a [[Pay per click|cost per click]];<ref>{{cite web|url=http://searchenginewatch.com/showPage.html?page=2167871|title=Submitting To Search Crawlers: Google, Yahoo, Ask & Microsoft's Live Search|date=March 12, 2007|access-date=May 15, 2007|publisher=[[Search Engine Watch]] |first1= Danny |last1=Sullivan |archive-url=https://web.archive.org/web/20070510090932/http://searchenginewatch.com/showPage.html?page=2167871#Teoma|archive-date=May 10, 2007|df=mdy-all}}</ref> however, this practice was discontinued in 2009.
[[Web search engine|Search engine]] crawlers may look at a number of different factors when [[Web crawler|crawling]] a site. Not every page is indexed by search engines. The distance of pages from the root directory of a site may also be a factor in whether or not pages get crawled.<ref name="cho">{{cite web|url=http://ilpubs.stanford.edu:8090/347/|title=Efficient crawling through URL ordering|author1=Cho, J. |author2=Garcia-Molina, H. |author3=Page, L. |year=1998|work=Seventh International World-Wide Web Conference |___location=Brisbane, Australia |publisher=Stanford InfoLab Publication Server |access-date=May 9, 2007|archive-date=July 14, 2019|archive-url=https://web.archive.org/web/20190714141416/http://ilpubs.stanford.edu:8090/347/}}</ref>
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