Ajax is the web technology that enable web application behave just like desktop application. One of the biggest problems with traditional web programs is that they have that “Web” feel — you have to keep clicking buttons to move from one page to another page, and watch the screen flicker as your browser loads a new Web page. Ajax is the technique that enables us to grab data from the server without reloading new pages into the browser.
Ajax communicate with the server behind the scenes, grab the data and display it instantly in a web page without refreshes page in the browser. Now these days Ajax is the hottest topic on the web. Ajax is now going to be the future of Web programming. The applications in your browser can look and work just like the applications installed on your computer.