Ajax is short for "Asynchronous JavaScript And XML" Ajax is a set of Web development techniques that use Web technologies on the client side to create asynchronous Web applications. With Ajax, Web applications can send and retrieve data from a server asynchronously (in the background) without interfering with the display and behavior of the existing page. This was made popular by Gmail. By decoupling the data interchange layer from the presentation layer, Ajax allows Web pages, and by extension Web applications, to change content dynamically without the need to reload the entire page.
Today, JSON is commonly used instead of XML due to the advantages of JSON being native to JavaScript.
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