Google wants that, your site get listed as fast as possible. To attain this, Google has released a new program, called Google Sitemaps. This helps to provide more information to spiders to crawl more your site and collect all information present in your website.
Basically, you create a sitemap of your site, using the XML format defined by Google, and you tell them where it is. Google then uses the information in this sitemap to find all the pages on your site faster.
Google uses programs like spiders and crawlers to search the content of your website. Once they are found in the site they follow all the links and gather all necessary information from your website. These programs periodically revisit your site and find new or edited content.
Google Sitemaps is an experiment in web crawling. By using Sitemaps, Google is increasing its coverage of the web and also speeding up the discovery and addition of pages to its index.
If you are using dynamic content and links that are not easily discovered by spiders than you can provide sitemap to Google. This will help spiders to know that what URL’s are present on your website and how often they change.
A Sitemap provides an additional view into your site. This program does not replace our normal methods of crawling the web. Google still searches and indexes your sites in the same way that it used earlier. A Sitemap simply gives Google additional information, sometimes not discovered by spiders.
Google's mission is to organize the world's information and make it universally accessible this collaborative crawling system will allow crawlers to optimize the usefulness of Google's index for users by improving its coverage and freshness.
The goal of Google Sitemaps is to provide a method of getting more pages in Google’s index and notifying updates to Google as soon as they occur. It is also helpful in determining the pagerank of a website.
The most powerful aspect of the new Google sitemaps features is the ability to quickly and easily identify errors on your website which may upset search engine spiders. If you get the specific information, it is very easy for a webmaster to quickly fix the problem. Google sitemaps has the potential to point out errors on your site that you may not have discovered on your own.