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.
An XML sitemap is a list of your website's URLs in simple language. It serves as a map for search engines, indicating what content is available and how to access it. With just one visit to the XML sitemap file, a search engine can find all nine pages in a sitemap in the example above.
An XML sitemap is a graphical method that demonstrates how the pages of a website are changed and applied. A list of URL links of the sites in the website is shown on this site map.
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It is also help in SEO because structure of website is important ranking factor.