For webmasters who are managing website assets through Google Webmasters Tools, the application provides a tool that helps you to build a sitemap, or a link directory that lists all the web pages contained within your website. The sitemap allows webmasters to manage additional information about each URL designed to inform the search engine bot about when the web page was last updated, how often new information is added, and it’s relation to other URLs in the site.
The Google Sitemap is specifically structured to allow search engine spiders to find and follow all the URLs and hyperlinks that lead to web content on your site so that it can be scanned and indexed. To be most effective, sitemaps should be search engine optimized, ensuring that both the links and the web page to which each link points are highly focused for the particular search term that identifies the content found on the web page.