A Sitemap.xml is an XML file that maps out the URL structure of a website and provides search engines with information about the organization of site contents. It lists URLs available for crawling and indexing, and can include additional metadata for each URL.
The Sitemap.xml helps search engines understand the structure of a website and ensure that all important pages are discovered and indexed. Especially for extensive or complexly structured websites, a Sitemap is essential to provide search engines with efficient access to all relevant pages.