Google Webmaster Tools...

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Google Webmaster tools is free services tools that can be provides by Google itself for Internet web user for checking and indexing rate and status of website.

The main checking steps of Google Webmaster tools are as –

• Submission checking of both kind of sitemap such as HTML and XML sitemap.
• Create and checking the robots.txt file usual disallow WebPages
• Use for checking and setting indexing rate of websit
• Also helping in checking traffic of individual keywords.

and some other use you just search Google Webmaster tools and find useful link.

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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