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 is part of a marketing effort to reach out to Webmasters and promote Google services. This is borne out by the fact that the tool does NOT cover search results from other search engines, such as Bing, Yahoo, or Baidu – something that is not clearly highlighted and understood by users.
It has tools that let the webmasters:
Submit and check a sitemap
Check and set the crawl rate, and view statistics about how Googlebot accesses a particular site
Generate and check a robots.txt file. It also helps to discover pages that are blocked in robots.txt by chance.
List internal and external pages that link to the site
Get a list of broken links for the site
See what keyword searches on Google led to the site being listed in the SERPs, and the click through rates of such listings
View statistics about how Google indexes the site, and if it found any errors while doing it
Set a preferred domain (e.g. prefer example.com over www.example.com or vice versa), which determines how the site URL is displayed in SERPs
highlight to Google Search elements of structured data which are used to enrich search hit entries (released in December 2012 as Google Hilighter)
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