Silverlight is a cross-browser, cross-platform (Mac OS, Windows and Linux) and cross-device browser plug-in that helps companies design, develop and deliver applications and experiences on the Web. Installed as a free browser plug-in approximately 4MB in size, in less than 10 seconds, Silverlight enables a new class of rich, safe, secure and scalable cross-platform experiences.
Silverlight harnesses the power of .NET and includes over 100 controls, rich layout and styling, a powerful networking stack, data access, support for HD video, and much, much more.