DirectX and OpenGL are collections of application programming interfaces (APIs) for handling tasks related to multimedia, game programming and video, and for writing applications that produce 2D and 3D computer graphics.
DirectX is a part of the Microsoft Windows operating system. It is a collection of application programming interfaces (API) that enable programmers to more easily make use of modern computers'...
OpenGL isn't a program, its an API to access features of a graphics card from an application. To use OpenGL programs, you either need a driver for your video card that supports OpenGL, or the...
it is difficult to give a precise answer in a couple of words: the directx libraries are huge. However, the idea is that these libraries expose an api (a set of instructions) that allow game...