AJAX, abbreviated as Asynchronous JavaScript and XML, is a web development technique for creating interactive web applications. The goal behind is to make web pages feel more responsive by exchanging small amounts of data with the server behind the scenes, so that the entire web page does not have to be reloaded each time the user requests a change. Ajax is proving to be real alternative for creating powerful Web Applications because it has been benefited from the sophisticated functionality using easier-to-implement web standard.

What is the reason behind the sudden popularity of Ajax design pattern?
practically, AJAX framework combines several technologies which includes:
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Justification
Basically Ajax Application Development overcomes the page loading requirements of HTML/HTTP-mediated web pages.The Goal of Ajax Application Development is to create the necessary initial conditions for the evolution of complex, intuitive, dynamic, data-centric user interfaces in web pages.
Unlike native applications, Web pages, are loosely coupled, meaning that the data they display are not tightly bound to data sources and must be first set out in proper order into an HTML page format before they can be presented to a user agent on the client machine. For this reason, web pages have to be re-loaded each time a user needs to view different datasets. By using the XmlHttpRequest object to request and return data without a re-load, a programmer by-passes this requirement and makes the loosely coupled web page behave much like a tightly coupled application, but with a more variable lag time for the data to pass through a longer "wire" to the remote web browser.
Ajax - a way to identify and describe a useful design technique is more of a Pattern than a Technology. Although Ajax application has existed for several years, Ajax design pattern is new to many developers who are just beginning to be aware of it.
How is Ajax different?
An Ajax framework has an Ajax engine in between the user and the server. It is written in JavaScript is responsible for both interpretations - between the interface and the server or between the server and user. Instead of loading a web page at the start of the session, the browser loads the Ajax engine. The Ajax engine then allows the user's interaction with the application to happen asynchronously - independent of communication with the server, so that the user is never staring at a blank browser window and an hourglass icon, waiting for the server to do something. An Ajax engine handles data validation, editing data in memory, and even some navigation by its own. Any user action takes the form of a JavaScript call to the Ajax engine instead of generating an HTTP request to the web server.
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