Sitemaps
Creating and submitting a Sitemap helps make sure that Google knows about all the pages on your site, including URLs that may not be discoverable by Google's normal crawling process. Google adheres to Sitemap Protocol 0.9 as defined by sitemaps.org. The Sitemap protocol uses an XML schema to define the elements and attributes that can appear in your Sitemap file. Previous versions of the schema (for example, Sitemap Protocol 0.84) are now deprecated.