Ajax is the shorthand for “Asynchronous JavaScript and XML. AJAX is a web development technique for creating interactive web applications. AJAX is basically used to make web pages feel more responsive by exchanging small amounts of data with the server working behind the scenes, so that the entire web page does not have to be reloaded every time the user requests a change. This increases the speed interactivity and usability of the webpage
Also, AJAX can make the development of rich client browser applications easier to manage. Instead of having whole applications posted back to a server, you can easily have small sections of a page updated independently of other sections of the page.
Learn how to incorporate the power of Ajax into your web projects.