If you feel the need for the fresher, richer, and more interactive Web experience, get to know AJAX
Enhanced User Experience - easy-to-use reactive and rich user interfaces offer enhanced attraction for end users.
Increased Performance - only small amounts of data are transferred between the client and the server. This delivers superior performance even for mobile users who hook up to the Internet via relatively slow GPRS or dial-up connections.
World-Wide Accessibility - In contrast to desktop applications, AJAX solutions are accessible from anywhere across the world by using any of modern web browsers.