AJAX stands for "Asynchronous JavaScript and XML."  It is a technology that facilitates the development of responsive web applications. AJAX function calls are made of Java Script, the popular client end programming language. The data retrieved through AJAX is formatted using XML. The asynchronous behavior of AJAX goes with the fact that loading does not get in the way of normal page loading.

AJAX is a "cross-platform" technology and can be used across various operating systems, computer architectures and different web browsers as it is based on XML and JavaScript that are open standards. It also supports open source implementations of other technologies. AJAX was used to implant great interactive features in Apple’s website.

AJAX is a technique for developing faster, better and more interactive web applications. In AJAX, you can have JavaScript communicate directly with the server, using the JavaScript "XMLHttpRequest" object. Using this object, the JavaScript can exchange data with a web server without reloading the pages. AJAX uses HTTP requests between the web server and the browser, permitting web pages to request small bits of information from the server against whole pages.