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Google Webmaster Tools is a no-charge web service by Google for webmasters. It allows webmasters to check indexing status and optimize visibility of their websites. It has tools that let the webmaster:

1. Check and set the crawl rate
2. List internal and external pages that link to the site
3. See the PageRank of your site
4. See what keyword searches on Google led to the site being listed in the SERPs, and the click through rates of such listings
5. View statistics about how Google indexes the site
6. Submit and check a sitemap
7. Generate and check a robots.txt file
8. Set a preferred domain (i.e prefer wikipedia.org over www.wikipedia.org or visa versa).