1. It makes your web site "search-engine friendly" as search engine crawlers use internal links to spider a site and do not crawl javascript links. Having a "Site Map" link at the index page ensures that the most important pages of your web site are definitely seen by those crawlers.
2. It can be used for documentation purposes by printing the menu structure. Sitemaps are one of the most exciting changes to happen at Google recently, and it will likely create a new competitive advantage for those who choose to use them.
3. A sitemap is a summary of all the visible pages on your site, organised by category, and with text links. It assists users with accessibility problems, older browsers, and search engine spiders use it to index the site if it is available. A sitemap is useful if any of your links are displayed as images, as search engines cannot index these, the same is true for any dynamically generated information. We recommend a sitemap for every web site, it allows you to direct a spider to certain areas and ensure that your site is effectively indexed.
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