Ajax (Asynchronous JavaScript and XML) is a technique to exchange the data with the server, updating part of a web page without reloading the page again. Using Ajax we can fetch data from various sources like XML, Json, Jsonp or MySQL Database. In this article you can learn how to implement ajax feature on your webpage and fetch data from various sources like XML, Json and Mysql database and display the data. I will be using jQuery ajax() function to do this task.