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Ajax, sometimes written as AJAX (shorthand for asynchronous JavaScript and XML), is a group of interrelated web development techniques used on the client-side to create interactive web applications or rich Internet applications.

The use of Ajax has led to an increase in interactive or dynamic interfaces on web pages and better quality of Web services due to the asynchronous mode.

With Ajax, web applications can retrieve data from the server asynchronously in the background without interfering with the display and behavior of the existing page. Like DHTML and LAMP, Ajax is not a technology in itself, but a group of technologies.

Ajax is a combination of followings

HTML and CSS for marking up and styling information.
The DOM accessed with JavaScript to dynamically display and interact with the information presented..
A method for exchanging data asynchronously between browser and server, thereby avoiding page reloads. The XMLHttpRequest (XHR) object is usually used, but sometimes an IFrame object or a dynamically added <script> tag is used instead.
A format for the data sent to the browser. Common formats include XML, pre-formatted HTML, plain text, and JavaScript Object Notation (JSON). This data could be created dynamically by some form of server-side scripting.

The term Ajax has come to represent a broad group of web technologies that can be used to implement a web application that communicates with a server in the background, without interfering with the current state of the page.