It's how your website is structured and helps bots crawl your website better and understand what it's about. There are lots of free websites where you can generate a sitemap and upload it in your website.
An XML sitemap is a file that list a website essential pages make sure google can find and crawl them all. It's makes easy to crawler and google bots when website is in structured form. There are also lots of free tools available on google, where you can generate sitemap and upload in your website. It is also help in SEO because structure of website is important ranking factor.
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It is also help in SEO because structure of website is important ranking factor.