According to Microsoft, Silverlight is necessary in order to view certain media files on the Internet. Silverlight must be installed on the browser in order to view these types of media. Supported browsers include Firefox, Internet Explorer, Safari, Opera and Chrome.
Silverlight is a free browser plug-in that is available for all major operating systems except Linux. It is used in the development of Internet software and media. Adobe's Flash is comparable to Silverlight in terms of its functions and roles, although Flash has a more developed niche. Silverlight was built using Microsoft's .NET Framework, which is another component that is required to run it.