There are two types of sitemaps, HTML and XML. An HTML sitemap provides a useful directory of all the pages that are in your site. While XML sitemaps play an important role in helping the search engine "crawl" the various pages of your site. This Roadmap discusses the benefit of creating both an HTML sitemap and XML sitemap, and how you can go about creating them using a sitemap generator. HTML Sitemaps
An HTML sitemap is a single HTML page that contains links to all the pages of your website. Normally, this is accessible via a link in your site footer, where it will be displayed on every page. With large sites, it is easy to get lost and struggle to find the page you are looking for. With a well organized HTML sitemap, your site visitors will be able to use this to easily find the page they are looking for.
From an SEO perspective, as the search engine's robot (or spider) crawls your site indexing pages, it may find some pages on your site easier using this sitemap, rather than through the general navigation. Therefore, sitemaps can benefit your site visitors and even play a role in enhancing your exposure on the web.
Take a look at WebAssist's sitemap to get an idea of what an HTML sitemap looks like. Notice that each page on the WebAssist website contains a link to this page in the footer.
HTML sitemaps are designed to benefit your human site visitors, whereas XML sitemaps are created specifically for the search engines. All of the most popular search engines including Google, Yahoo and Ask.com utilize XML sitemaps as part of their process for indexing the pages of a website. A good XML sitemap will tell the search engine what pages are in your site, how often those pages are updated, and when they were last modified. This way, the search engines know which pages to revisit more regularly, and are likely to do a better job of indexing them. Here's an example of the XML you might include in your XML sitemap:
Notice that for the index.htm page of this website, we have provided details regarding the last modified date (
TIP: Be honest about the information you provide in your sitemap. If a search engine finds that you are not updating your site as often as your sitemap suggests, they may come back less often.