An XML sitemap is a file that contains structured information about all of the important pages on a website. This data is presented in a list format and helps ensure that search engines can efficiently find, crawl, and comprehensively understand a website’s content.
Most websites can benefit significantly from having an XML sitemap because it allows Google to locate and index all of your most critical web pages. For example, if a certain page lacks an internal link pointing to it, it can be difficult for crawlers to find it. With an XML sitemap, Google can find all of your essential pages in one place and easily check if they have been recently updated.
An XML sitemap is particularly useful for large websites with extensive archives and rich media content. It can also benefit new websites that have not yet acquired many external backlinks. Conversely, smaller websites with a dense network of internal links may find it less necessary.