A sitemap is an XML file that lists the URLs for a website. It allows search engines to more easily crawl and index the pages on a website, helping to improve the website's search engine optimization (SEO). Sitemaps can also include additional information about each URL, such as when it was last updated, how often it changes, and how important it is in relation to other URLs on the site. Some website builders and content management systems have built-in functionality to generate sitemaps, while others may require a third-party plugin or tool.
An HTML sitemap is a page on a website that lists the different sections and pages of the website in a hierarchical format, with links to each page. It is meant to be a helpful navigation tool for users to easily find the content they are looking for on the website. Unlike XML sitemaps, which are primarily used for search engine optimization (SEO), HTML sitemaps are intended for human visitors to a website. It is typically placed in the footer of the website, so it is accessible from any page. The HTML sitemap is an alternative to the xml sitemap that is more user friendly and can help increase the website's usability.