WPF (Windows Presentation Foundation) is Microsoft's user interface development framework based on Windows, belongs to part of the .Net Framework. It provides a unified programming model, languages and frameworks, indeed makes the interface design and the development work separate. Plus, WPF supports a brand-new multimedia interactive graphics user interface. As a major change in the Windows operating system, unlike the early GDI/GDI+, WPF is based on the DirectX engine that supports both software rendering and GPU hardware acceleration at the same time.