Windows Driver Foundation (WDF) is a set of Microsoft tools that aid in the creation of device drivers for Windows 2000 and later versions of Windows.
The primary tools that comprise WDF are the Kernel Mode Driver Framework (KMDF) and User Mode Driver Framework (UMDF). These tool kits provide a new object-oriented programming model for Windows driver development. The primary goal of the Frameworks is "conceptual scalability", that is the characteristics of only requiring a driver developer to learn a few simple concepts to be able to write a simple driver, and to be able to incrementally learn more when more complex driver features are required. This differs markedly from the Windows Driver Model (WDM) which requires driver developers to be fully familiar with many complex technical details before writing even a simple driver.
Part of the key to achieving conceptual scalability is that KMDF and UMDF use an "opt-in" model. This model allows the developer to extend and override the default behavior of a canonical "good driver". This is in contrast to the older Windows Driver Model that depends on the driver writer to implement all aspects of the driver's behavior.
Read more about Windows Driver Foundation: Varieties, Tools, Versions
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