A Microsoft programming interface standard, first included with Windows 95. DirectX gives (games) programmers a standard way to gain direct access to enhanced hardware features under Windows 95 instead of going via the Windows 95 GDI. Some DirectX code runs faster than the equivalent under MS DOS.
DirectX promises performance improvements for graphics, sound, video, 3D, and network capabilites of games, but only where both hardware and software support DirectX.
DirectX 2 introduced the Direct3D interface. Version 5 was current at 1998-02-01. Version 8.1 is included in Windows XP.