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What exactly is DirectX ?

It's not a driver, it's an API for developers to use when coding games/applications....usually games. Someone who's done some coding using the API could explain better.
 
It's the layer between the programmer and the video driver. You talk to DirectX, which then talks to the video driver. I'm sure the story is more comlicated but I believe that's the basics.
 
It's an industry standard set of tools to help the programmer interface with a reciprocally compliant video card. It encompasses mainly objects and functions. Among the objects it offers are a display device, 3D surfaces, and arrays of vertexes. An example of a function would be one to draw a triangle on the screen. Direct3D (the API) defines what these functions are to receive, and in exactly what arrangement.
 
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