Microsoft Silverlight is a free and programmable web browser plugin, which enables interactive media features such as animation, audio-video playback and vector graphics, so you can experience rich and vibrant Internet applications.

Silverlight offers a flexible programming model that supports AJAX, VB, C#, Python, and Ruby, and integrates with existing Web applications.

It supports fast, cost-effective delivery of high-quality video to all major browsers running on Mac OS or Windows OS.