I'm a geekette who enjoys playing with new technology for software developers. I work as a Developer Evangelist for Microsoft. My current focus is on Windows Store development for Windows 8.
In my role, I work with a number of large corporations, and this is a question that they ask me regularly: What is the difference between the Windows Presentation Foundation (WPF) and Silverlight, and in what scenarios does it make sense to use each?
Microsoft feels that user experience is important, and invested in multiple technologies to promote better user experience. Both WPF and Silverlight use XAML (Extensible Application Markup Language) under the covers.
Let's look at some of the different characteristics of each technology:
When should you use each? The maddening answer is (of course): it depends!
WPF is a more mature technology and was designed with a richer feature set. It also has the advantage of being able to run in a browser or as an installed Windows-Form-type app.
Silverlight has a broader reach. You can access Silverlight from many operating systems and web browsers.
The most important reason to choose one over the other should be based on the intended audience for the application. For example, if a corporation is designing an application for internal use only and every employee has Windows XP as the company standard OS, then go with WPF to leverage the richer feature set. If a corporation is designing an external-facing website, then Silverlight is the better choice because potential customers can access the website from a variety of different operating systems and browsers.