XML sitemaps must be a vital piece of your technical SEO strategy. XML sitemaps help search engines crawl your website more efficiently
An XML sitemap is a file that provides a list of URLs for search engines, such as Google, Bing and Yahoo, to crawl. XML sitemaps can contain attributes that provide additional information about each URL for crawlers. If you are unfamiliar with XML sitemaps I recommend you read another article on the Oncrawl blog: XML sitemaps: the Swiss army knife of technical SEO. The article gives a nice overview of XML sitemaps for beginners and some basic use cases.