DirectX is a set of multimedia Application Programming Interfaces (API's) written by Microsoft. It is a collection of Dynamic Link Libraries (DLLs) that contain functions useful to a wide range of multimedia programmers, but are all almost entirely platform independent. This allows programmers access to fast graphics, sound, and input functions while not needing their apps to test for the capabilities of the computer on which their program is running. DirectX will evaluate these capabilities and if they are not present, DirectX may attempt (in many cases) to emulate the functions in software instead of hardware.
Another feature of DirectX is the capability of DirectX applications to run side by side with non DirectX applications without causing any system problems. Lastly, DirectX would have the performance that was capable in DOS while meeting all the other specifications
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