What is the sitemap.xml file?
Sitemap.xml file shows how many pages are there in your website.
A Sitemap is a directory of all the pages of your website. An XML Sitemap is a sitemap designed specifically for the search engines to read. It helps Google make sure is has found every page on your website.
A Sitemap is an XML file that lists the URLs for a site. It allows webmasters to include additional information about each URL: when it was last updated, how often it changes, and how important it is in relation to other URLs in the site. This allows search engines to crawl the site more intelligently.