Libraries like the DirectX and OpenGL are used to help draw graphics in C++.
There are two types of monitors: CRT and LCD
Their difference will be such as CRT uses a scan line to print out images while the LCD creates images by passing polarized light.
There are also many uses for computer graphics such as for arts and cinematic movies.
Certain industries were built in order to improve qualities of these graphics for future use.
Qualities of computer graphics has increased drastically from the old times till the modern years.
Examples of such old games with graphics ith pixels are Pong and Doom 1.
Examples of modern games with such realistic graphics are: unreal tournament and quake.
The increase in the amount of realism that computer graphics has over the years has increased dramtically over the years. From the very pixel and cartoony looking games such as Doom 1, to the realistic games such as unreal tournament.