What is computer graphics?

The term computer graphics includes almost everything on computers that is not text or sound.
But can be indicated in the terms of pictures or images or the programs.Today almost every computer can do some graphics, and people have even come to expect to control their computer through icons and pictures rather than just by typing.
computer graphics as drawing pictures on computers, also known as rendering.And now a days we just dont want the images to look colourfull but also realistic.And that in words are called a s Realistic Image Synthesis.
and the following series of pictures will show some of our techniques in stages from very simple pictures through very realistic ones.