A sitemap is a file that lists all the pages of a website, helping search engines like Google understand its structure. It acts as a roadmap, guiding crawlers to discover and index the content efficiently. Sitemaps can be in XML format for search engines or HTML format for users, making navigation easier. Creating a sitemap is beneficial for both website owners and visitors. It ensures that all important pages are included and can improve a site's visibility in search results. Additionally, a well-organized sitemap enhances user experience by allowing visitors to find information quickly and easily.