What is the difference of DirectX and OpenGL?

OpenGL is only a 3D graphics API, but it can be used with SDL for input, sound, etc.

Direct X has:

-DirectInput for input
-DirectSound for sound
-Direct3D for a 3D graphics API
-DirectPlay for multiplayer capabilities
-DirectDraw for 2D graphics

And probably a few other things.

Direct3D and OpenGL are ultimately the same thing, and SDL is great with 2D graphics, and it is alot easier to use than DDraw, DInput, and DSound. HawkNL can be used with OpenGL for multiplayer stuff.

There really isn''t much of a difference, but this:

OpenGL and SDL can be ported to *many* platforms (Operating Systems) and DirectX is only for Windows.

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Simple DirectMedia Layer:
Main Site - (www.libsdl.org)
Cone3D Tutorials- (cone3D.gamedev.net)
GameDev.net''s Tutorials - (Here)

I see,thanks.