DirectX is a technology from Microsoft, which is a collection of Application Programming Interfaces (APIs) for handling tasks related to multimedia, especially game programming and video, on Microsoft platforms. Originally, the names of these APIs all began with the word Direct, such as Direct3D, DirectDraw, DirectMusic, DirectPlay, DirectSound, and so forth. But later on the name DirectX was coined to refer to all of these APIs (the X standing in for the particular API names) and this continued to be the name of the collection. When Microsoft developed a gaming console called ‘Xbox’,to indicate that the console was based on DirectX technology. The initial X has been used in the naming of APIs designed for the Xbox such as XInput and the Cross-platform Audio Creation Tool (XACT), while the DirectX pattern has been continued for Windows APIs such as Direct2D and DirectWrite.
For the development of video games for Microsoft Windows, Microsoft Xbox, and Microsoft Xbox 360, 3D graphics API within DirectX (Direct3D) is being widely used. Other software applications for visualization and graphics tasks such as Computer Aided Design / Computer Aided Manufacturing engineering use Direct 3DYou would have observed that the terms ‘Direct3D’ and ‘DirectX’ have been used interchangeably.
The DirectX Software Development Kit (SDK) consists of runtime libraries in redistributable binary form, along with accompanying documentation and headers for use in coding. Originally, the runtimes were only installed by games or explicitly by the user. Windows 95 was not launched with DirectX but it was included with Windows 95 OEM (Original Equipment Manufacturer) Service Release 2Windows 98 and Windows NT 4.0 both contained DirectX which SDK can be downloaded for free.
The new versions of DirectX such as Direct3D 9Ex, Direct3D 10 and Direct3D 11, available only for Windows Vista and Windows 7 were built to depend upon the new Windows Display Driver Model.
Direct3D 9Ex: this allows full access to the new capabilities of drivers while maintaining compatibility for existing Direct3D applications. The new Vista/Windows Display Driver Model graphics architecture includes a new video memory manager that supports virtualizing graphics hardware to multiple applications and services such as the Desktop Window ManagerDirect3D

10: It is designed around the new driver model in Windows Vista and featuring a number of improvements to rendering capabilities and flexibility.
11:It has the major features of multithreading support to assist video game developers in developing games that better utilize multi-core processors.


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