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A site map of what links from the English Wikipedia's Main Page.
Sitemap of GoogleA site map (or sitemap) is a graphical representation of the architecture of a web site.  It can be either a document in any form used as a planning tool for web design, or a web page that lists the pages on a web site, typically organized in hierarchical fashion. This helps visitors and search engine bots find pages on the site.
While some developers argue that site index is a more appropriately used term to relay page function, web visitors are used to seeing each term and generally associate both as one and the same. However, a site index is often used to mean an A-Z index that provides access to particular content, while a site map provides a general top-down view of the overall site contents.
1 Benefits of sitemaps
2 XML Sitemaps
3 See also
5 External links
 Benefits of sitemaps
Most search engines will only follow a finite number of links from a page, so if a site is very large, the site map may be required so that search engines and visitors can access all content on the site.
 XML Sitemaps
Google introduced Google Sitemaps so web developers can publish lists of links from across their sites. The basic premise is that some sites have a large number of dynamic pages that are only available through the use of forms and user entries. The sitemap files can then be used to indicate to a web crawler how such pages can be found.
Google, MSN, Yahoo and Ask now jointly support the Sitemaps protocol.
Since MSN, Yahoo, Ask, and Google use the same protocol, having a sitemap lets the four biggest search engines have the updated page information. Sitemaps do not guarantee all links will be crawled, and being crawled does not guarantee indexing. However, a sitemap is still the best insurance for getting a search engine to learn about your entire site. 
 See also
Sitemaps, a standard for URL inclusion
^ Peter Morville, Information Architecture on the World Wide Web, Feb 1998, pp:58
^ Joint announcement from Google, Yahoo, MSN supporting Sitemaps
Specification of the common XML format.
 External links
Common Official Website - Jointly maintained website by Google, Yahoo, MSN for an XML sitemap format.
Tips about Sitemaps Build a sitemap at a mouse click with an open-source sitemap generator (XML, text or HTML).
JSiteMap A Java open source site map generator.
Online Sitemap Generator Free online sitemap generator
Retrieved from "http://en.wikipedia.org/wiki/Site_map"