HTML Sitemap Explained
How to create HTML Sitemap and how does it help a website
An HTML sitemap allows site visitors to easily navigate a website. It is a bulleted outline text version of the site navigation. The anchor text displayed in the outline is linked to the page it references. Site visitors can go to the Sitemap to locate a topic they are unable to find by searching the site or navigating through the site menus.
This Sitemap can also be created in XML format and submitted to search engines so they can crawl the website in a more effective manner. Using the Sitemap, search engines become aware of every page on the site, including any URLs that are not discovered through the normal crawling process used by the engine. Sitemaps are helpful if a site has dynamic content, is new and does not have many links to it, or contains a lot of archived content that is not well-linked.
An example of HTML sitemap, created for xml-sitemaps.com: sitemap.html (separated with 1,000 links per page)
Please also check the video with Google's head of Webspam team, Matt Cutts, explaining the importance of HTML sitemap