Simply put, DirectX is a Windows technology that enables higher performance in graphics and sound when you're playing games or watching video on your PC.
At the core of DirectX are its application programming interfaces, or APIs. The APIs act as a kind of bridge for the hardware and the software to "talk" to each other. The DirectX APIs gives multimedia applications access to the advanced features of high-performance hardware such as three-dimensional (3-D) graphics acceleration chips and sound cards. They control low- level functions, including two- dimensional (2-D) graphics acceleration; support for input devices such as joysticks, keyboards, and mice; and control of sound mixing and sound output.
Because of DirectX, what you experience with your computer is better 3-D graphics and immersive music and audio effects.
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