AJAX is a web application model which uses the advantageous features of different technologies, each performing different functions to produce dynamic and interactive web applications.
AJAX allows content on web pages to update immediately when a user performs an action, unlike an HTTP request, during which users must wait for a whole new page to load. AJAX will give a respite by allowing web pages to load in fraction of a second. More and more websites nowadays, especially heavy websites, are implementing this method.
AJAX has been given a thumbs-up by many big web enterprises including Google. Google Maps is one well-known application that uses AJAX. The interface allows the user to change views and manipulate the map in real time. AJAX applications do not require installation of a plug-in, but work directly with a web browser. Because of the technique's reliance on XMLHttpRequest, early applications worked only with Microsoft's Internet Explorer browser, but most other browsers now support AJAX.