Direct3D is part of
DirectX API. Direct3D is only available for Microsoft's various Windows
operating systems (Windows 95 and above).Microsoft DirectX is an
advanced suite of multimedia application programming interfaces (APIs)
built into Microsoft Windows; operating systems. DirectX provides a
standard development platform for Windows-based PCs by enabling software
developers to access specialized hardware features without having to
write hardware-specific code.
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.Direct3D uses hardware acceleration if it is available
on the graphic board.
You can get latest version of Direct3D at
Microsoft Direct3D.This download is available free of charge for
genuine Microsoft Windows users.