Windows Presentation Foundation (WPF)
Definition - What does Windows Presentation Foundation (WPF) mean?
WPF is a subsystem in the Windows OS that appeared in the Windows Vista version. It is also a component of .NET framework 3.0, providing programming tool and technique for graphical development and the authoring of applications.
WPF was formerly known as Avalon.
Techopedia explains Windows Presentation Foundation (WPF)
WPF provides services such as support for extensible application markup language (XAML), 2-D and 3-D graphics, animation, styles, data binding and other graphical control elements essential for application developers.