Google Webmaster Tools
Google Webmaster is a control panel for a web site that gives you the complete detail about your site like index pages, broken links, crowing states, search queries for your site, errors about your site, shows when Google crawler acceded your site, shows
keyword density, HTML Suggestion like any duplicate title or description error so this way Google web master is a mirror for your site that shows your site crawling performance on the Google and to use Google webmaster first of all you need to verify your site on Google webmaster in the Google webmaster after verification you can also submit sitemap of your site that will tell Google bot all about your site links and helps in crawling and indexing.
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