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A sitemap is normally known as a file of the XML type which has the function of listing the URLs for any site. The sitemap allows the webmaster to add further information about the URL such as the last updates, the changes in the URLs and how often it is made, and also the importance of the URL in relation to the others. Sitemaps can prove to be beneficial in certain situations such as the inability of the user to access every area of a particular website through the interface of a browser.

Nirmala wrote that in 2009. He wrote the other bits you left out too. Why are you copying material onto our site?

How does a sitemap work? - SEO- Search Engine Optimization Webmaster Forum

A sitemap will help you to index all your website pages in search engines, Search for sitemap generater in Google and generate, After that you can submit it through Google Webmaster tools.

Just like MetaTags, it's obsolete because of the way Google works anyway. Google spiders its way through everything, be it Page Title or Page Content. It doesn't need, or bother with scam submittance programs. So don't bother spamming them here.

Sitemap is the file that contains all your website inner page URLs. It helps search engines like Google to crawl all your websites inner page URLs so that all your website URLs indexed very quickly in Google listing.