JQuery
AJAX (Asynchronous JavaScript and XML) is a fairly recent web technology for interactive Web applications and is mainly used to make the interaction between the web page and the server faster. Because it is possible for only portions of a Web page to reload the server is less burdened and it is possible for user-specific data to be shown in a simple way.
What is jQuery
jQuery is an amazing library for developing AJAX based application. jQuery simplifies the development of web 2.0 applications for JavaScript developers.
An example of a jQuery project: