An XML sitemap is a document that helps Google and other major search engines better understand your website while crawling it. A good XML sitemap is a road-map to all important pages of a website. A Sitemap is an XML file that lists the URLs for a site. It allows webmasters to include additional information about each URL: when it was last updated, how often it changes, and how important it is in relation to other URLs in the site. XML Site maps are documents that assist Google, Bing, and other search engines to understand a website's content while looking through it for information users are looking for.