First, your design is converted to the language a computer understands
The scale 2D drawing is extruded into 3D parts. This saves time and money when deciding on the visuals of the outcome.
G-code is an instruction manual sent to the machine. The tool moves across 3 planes X, Y & Z (front/back, left/right & up/down).
There has been a lot of trial and error. Continual improvement means the cuts are now clean and accurate.