The purpose of an XML sitemap is to make it easier for search engines to find and index all the content on a website. Without an XML sitemap, search engines may not be able to find all of the pages on a website, particularly if they are not linked from other pages on the site. This can lead to a lower ranking on search engine results pages and a reduction in traffic to the site.
An XML sitemap includes information about each page on the site, including the date it was last modified, how frequently it is updated, and its priority compared to other pages on the site. This information helps search engines to crawl and index the site more efficiently, improving the site’s visibility and ranking in search results.
In WordPress, an XML sitemap can be generated automatically using a plugin, such as Yoast SEO, All in One SEO Pack, or Google XML Sitemaps.