Microsoft Silverlight
Developed by	Microsoft
Initial release	April 2007
Stable release	1.0.30401.0  (08 April 2008) [+/−]
Preview release	2.0.30226.2  (5 March 2008) [+/−]
Written in	combination of C++ and C#
OS	Microsoft Windows, Mac OS X
Genre	Web Application framework
License	MS-EULA, with MS-PL components
Website	Microsoft Silverlight Silverlight.net

Microsoft Silverlight is a web browser plugin that provides support for rich internet applications such as animation, vector graphics and audio-video playback. Silverlight competes with products such as Adobe Flash, Adobe Flex, Adobe Shockwave, JavaFX, and Apple QuickTime. Version 2.0 brought improved interactivity and support for .NET languages and development tools.

Silverlight was developed under the codename Windows Presentation Foundation/Everywhere (WPF/E). It is compatible with multiple web browser products used on Microsoft Windows and Mac OS X operating systems. Mobile devices, starting with Windows Mobile 6 and Symbian (Series 60) phones, will also be supported.^[1]. A third-party free software implementation named Moonlight is under development to bring compatible functionality to GNU/Linux.