what is openGL(introduction)?

what is openGL?

opengl is not a programming language and not a window application and not a data structure container. so opengl is a software interface to the graphics hardware.it does depend upon the operating system. it gives the user tools to create the high quality rendering. for opengl we include
#include"glut.h"
opengl is device independent. opengl is an API. it controls whatever hardware you are using.and use its function instead of controlling hardware directly. opengl is open source.

openGL

library to include: 

1) GLUT: it initialize toolkit, open windows, develop menus, and manage events.

2) GLU : it provide high level routne to handle the complex mathematical and drawing function.

3) GLUI : the user interface library which completely integrate with GLUT library.