The processing cores run small programs on the GPU for each step of the pipeline. Because of their parallel nature, graphics cards of today have thousands of small processing cores to quickly process your data within the graphics pipeline. All of these steps are highly specialized (they have one specific function) and can easily be executed in parallel. The graphics pipeline can be divided into several steps where each step requires the output of the previous step as its input. The graphics pipeline takes as input a set of 3D coordinates and transforms these to colored 2D pixels on your screen.
In this chapter we'll briefly discuss the graphics pipeline and how we can use it to our advantage to create fancy pixels. The graphics pipeline can be divided into two large parts: the first transforms your 3D coordinates into 2D coordinates and the second part transforms the 2D coordinates into actual colored pixels. The process of transforming 3D coordinates to 2D pixels is managed by the graphics pipeline of OpenGL. In OpenGL everything is in 3D space, but the screen or window is a 2D array of pixels so a large part of OpenGL's work is about transforming all 3D coordinates to 2D pixels that fit on your screen. Hello Triangle Getting-started/Hello-Triangle
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