A sitemap is a map of the website. It is a navigation tool for reference all the content on the website. It usually is a single page which show the entire site, links, pages, archives etc. It helps the visitor the navigate the site. The concept of sitemap is the index of a book.
Sitemap usually lists URLs for the site with additional metadata about each URLs (Last updated of web, the changing website frequency, relative to other URLs in the site) so that search engines can more intelligently crawl the site.
Sitemaps helps to communicate with the search engines (ie. google, yahoo). However, the search engines's spiders may need to use xml format. Therefore, it is a great idea to develop a sitemap for the search engines's spider and one for the visitor to use.
This website describes the XML schema for the Sitemap protocol.
sitemaps.org - Sitemaps XML format
There are lots of sitemaps format, however, XML format of sitemap is easier to dectect with the search engines.
There are also lots if sitemap generators of in the internet.
This website provide lots of generators with the sitemap protocol of the sitemaps.org
Lastly, don't forget to build the sitemap for your sites which enhance your sites to be a professional website.
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