A sitemap is a blueprint of your website that helps search engines find, crawl, and index all of your website’s content. Sitemaps also help search engines understand which pages on your site are the most valuable for viewers.
In other words, a sitemap shows Google which pages and files you think are essential for your site and also provides valuable information about these files. For instance, it can depict when a page was last updated, how often it’s changed, or any alternate language versions of the same content.
You can use a sitemap to provide information about specific types of content on your pages, including video and image content. It’ll help make whatever you add more visible to searchers and search engines. For more information on Sitemaps see the rankingCoach Blog article What Is A Sitemap?