sitemap.xml file

Hello friends,
Please tell me what is the sitemap.xml file?

XML-sitemap represents is collection of urls, It is helpful for web page indexing or crawling through bots.

It is an XML sitemap file. It is a coded sitemap used to submit in webmaster tool to help spiders crawl them and index the webpages in search engines.

Sitemap is an XML file that lists URLs for a site along with additional metadata about each URL (when it was last updated, how often it usually changes, and how important it is, relative to other URLs in the site) so that search engines can more intelligently crawl the site.