Submit a Sitemap XML File to Search Engines

How to Submit a sitemap XML File to Search Engines
Once you have created the Sitemap XML file and placed it on your web server then, you need to inform the search engines that support this protocol of its location.
We can submit the sitemap in 4 ways given below:

• Submitting it to them via the search engine's submission interface.
• Specifying the location in your site's robots.txt file.
• Sending an HTTP request
• Submitting throw Google webmaster Tool.

Submitting it to them via the search engine's submission interface:
To submit your Sitemap XML file directly to a search engine, which will enable you to obtain status information and any giving out errors, refer to each search engine's documentation.

Specifying the Sitemap location in your robots.txt file:
Sitemap: <sitemap_location>
The <sitemap_location> should be the complete URL to the Sitemap, such as: http://www.example.com/sitemap.xml.
This directive is independent of the user-agent line. If you have a Sitemap index file, you can include the location of just that file. You don't need to list each individual Sitemap listed in the index file.
You can specify more than one Sitemap file per robots.txt file.
Sitemap: <sitemap1_location>
Sitemap: <sitemap2_location>
Submitting your Sitemap via an HTTP request:
To submit your Sitemap using an HTTP request (replace <searchengine_URL> with the URL provided by the search engine), issue your request to the following URL:
<searchengine_URL>/ping?sitemap=sitemap_url
For example, if your Sitemap is located at http://www.example.com/sitemap.gz, your URL will become:
<searchengine_URL>/ping?sitemap=http://www.example.com/sitemap.gz