Google Sitemap is a new service that Google has provided to inform and direct crawlers. They want to index more pages and discover the web better and faster. With Sitemaps you can make sure all your pages are crawled and indexed quickly by Google.
This service is free and easy to use. You should create a sitemap file in XML format then submit it to Google Sitemaps and update your site map when change your site.
A sample Sitemap that contains just one URL and uses all optional tags is shown below. The optional tags are in italics.
<?xml version="1.0" encoding="UTF-8"?>
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