XML is one of the core factors of an Ajax based application. Although there are other data formats that could be considered with JavaScript such as HTML and JSON, none of them provides the universality and lightweight features found in XML. This form of data could interact with any browser in any version and it will not have any heavy footprint which ensures the accessibility of the application. This is very important especially in building efficient client side application. Through proper use of XML, it can improve the website significantly without requiring too many resources. There are many retrieval techniques allowed within Ajax. But the most popular and probably the