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What is Ajax?

As we know, Ajax stands for Asynchronous JavaScript + XML. In addition, Ajax isn’t only one technology. It contains several technologies, each works in its own right, and they are together working in powerful new ways. Ajax incorporates:

standards-based presentation using XHTML and CSS;
dynamic display and interaction using the Document Object Model;
data interchange and manipulation using XML and XSLT;
asynchronous data retrieval using XMLHttpRequest;
JavaScript binding them together.

There is a picture below to help us to understand the different between classic web application model and Ajax web application model.