Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. It is also known as Google Sitemap because it was introduced first by Google.

The Distinction of XML lies in that it allows you to include additional information about each URL such as the date it was last updated, how often it changes, and how important it is. XML format ensures that this information can be easily processed on different kinds of computers, applications and systems, so Search engines (Google, Yahoo, Bing, Ask, AOL etc) won't have any problems with understanding your sitemap files. The Secret behind that the design goals of XML emphasize simplicity, generality, and usability over the Internet.
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The Importance of XML to Your Website:
This language makes your site visible and easy to get found by Search Engines. Moreover, it provides the search engines with important information about your website; complementing their traditional methods of crawling the web. Google, Yahoo, Microsoft's Bing (MSN), and Ask have up-to-date information any time you upload a new map file to your server.

Simply put, XML will contribute to enhance your internet presence, in all the following cases:

-  Having a brand new website

-  Your web-site has dynamic content generated by CMS (Joomla, Wordpress, Drupal, DotNetNuke, etc)

-  The website has a lot of pages

-  You don't have desired Google Page Rank

-  Your website has complex navigation

-  Some of your webpages are either not accessible from the main page and its children, or are buried too deep in the page hierarchy 
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Implementing XML Sitemap
There are three parameters need to be taken in consideration while implementing XML Sitemap:

Page Changing Frequency: it refers how frequently the content at a particular URL is likely to changeLast Modified Date: The time the URL was last modified in order to avoid search engines recrawling documents that haven’t changed. You can let the generator take the information from your server or specify your own date and time.Page Priority: The priority of a particular page relative to other pages on the same website. As Google specified the value for this tag is a number between 0.0 and 1.0 where 0.0 identifies the lowest priority page(s) on your website, and 1.0 - the highest. The default priority of a page is 0.5. Note that our map builder can generate page priorities for you automatically by analyzing relative positions of your web pages in the website tree.Page Changing Frequency: it refers how frequently the content at a particular URL is likely to change

Last Modified Date: The time the URL was last modified in order to avoid search engines recrawling documents that haven’t changed. You can let the generator take the information from your server or specify your own date and time.

Page Priority: The priority of a particular page relative to other pages on the same website. As Google specified the value for this tag is a number between 0.0 and 1.0 where 0.0 identifies the lowest priority page(s) on your website, and 1.0 - the highest. The default priority of a page is 0.5. Note that our map builder can generate page priorities for you automatically by analyzing relative positions of your web pages in the website tree.