A document that allows search engines to easily crawl and index all of the content on a domain. In its most basic form, a sitemap is a list of all of the pages on your domain that you would like search engines to find and show to users. Sitemaps should only include pages that return a 200 response code. Sitemaps should incude the location of the page (URL), the date that it was last modified, change frequency and priority relative to other pages on the site.