There are two types of sitemaps that you can create to help search engines crawl your website. The first is an HTML file labeled sitemap.html. This file provides the links to all the pages within your website in a simple list fashion and usually categorized. They HTML file helps search engines figure out how all the pages on your site are linked together so that it does not miss anything as it crawls your site. This is also helpful to users who may be looking for a page in a paticular category or section of your website. The sitemap.html file should be linked from the most important areas of your website (usually the home page).