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The Windows Presentation Foundation (or WPF), formerly code named Avalon, is the graphical subsystem feature of the .NET Framework 3.0 (formerly called WinFX)[1] and is directly related to XAML.[2] It is pre-installed in Vista,[3] the latest version of the Microsoft Windows operating system. WPF is also available for installation on Windows XP SP2 and Windows Server 2003. It provides a consistent programming model for building applications and provides a clear separation between the UI and the business logic. A WPF application can be deployed on the desktop or hosted in a web browser. It also enables richer control, design, and development of the visual aspects of Windows programs.

Microsoft Silverlight is a subset of WPF. During development it was named WPF/E, which stood for "Windows Presentation Foundation Everywhere". Silverlight is a web-based subset of WPF, based on XAML and Javascript. The Silverlight subset enables Flash-like (ma77ad copy!) web and mobile applications with the exact same code as Windows .NET applications. 3D features are not included, but XPS, vector-based drawing and hardware acceleration are.