what exactly is direct x???

Directx is a microsft addon which allows computers which support directx access to hardware for faster operation. Most video and sound cards have support for directx. If you search for the directx folder in xp you will find a shortcut to the directx diagnostic utility which when clicked will give you a better idea of what it does.
 
It is hardware access.

Mostly, it has to do with graphics.

However, sound cards are also added to the list of hardware.

OpenGL is other standard for graphic Hardware access, DirectX is Micrsoft's version of it. Just like Virtual Java Machine is Microsoft's verison Java by SUN. Microsoft has to get their hands into everything.
 
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