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NDIS stands for Network Driver Interface Specification, and is an application programming interface (API) for network interface cards (NICs). It is mostly used in Microsoft Windows and Intel-based computers and was jointly developed by Microsoft and the 3Com Corporation.
The NDIS is a Logical Link Control (LLC) that forms the upper sublayer of the OSI data link layer (layer 2 of 7) and acts as an interface between layer 2 and 3 (the Network Layer). The lower sublayer is the Media Access Control (MAC) device driver.
The NDIS is a library of functions often referred to as a "wrapper" that hides the underlying complexity of the NIC hardware and serves as a standard interface for level 3 network protocol drivers and the hardware level MAC drivers. Another common LLC is the Open Data-Link Interface (ODI).
See also: NDIS (http://www.ndis.com/)
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