Using Google Webmaster Tools :
Using Google Webmaster Tool is most preferred way for making Google aware of sitemap file you have for your website. Google webmaster tool is very useful for all webmasters. There are may advantages if you are submitting your sitemap through Google Webmaster Tool like you’ll always have direct feedback about how your Sitemap files were downloaded , how they were recognized where it was in right format and what happened to the web pages listed in them, does any of page where have been indexed ?
Before you submit your Sitemap files you need to make sure that your website is verified in Webmaster Tools, once approved you need to go to “Sitemaps” in Webmaster Tools and enter the file name of your Sitemap(s).

Listing Sitemap files in the robots.txt file :
You can use another way of submitting a Sitemap file if you don’t want to use Google Webmaster Tool, in this case you will have to specify the URL in your robots.txt file.
Using this method your sitemap file could be easily found by all major search engines that support Sitemap protocol
As in this process you can specify the full URL of your Sitemap file in your robots.txt file thus using this method you can store your Sitemap file on a different domain. If you are using this method then the sitemap would not be get listed in your webmaster Tools account, you will have to add it manually to your account.

Using an HTTP “ping” :
If your site is dynamic site where pages are created dynamically then in this case you you can generate sitemap files automatically, and for such automatically created sitemaps the best way for submitting/resubmitting them is to access the “ping” URL for Google Sitemaps. You can use this method even if  your Sitemap file is kept on a different server, but you must still verify both sites in your Webmaster Tools.

All search engines that are members of sitemaps.org support a similar way of submitting general web Sitemap files.

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