Hello guys!

I would have a question about CNC milling, laser cutting and 3d printers. Moi can export shapes into them by STL format. there is only one things make me confusing namely the resolution. STL as based on polygon format and how do the machines handle the resolution of the curved surfaces? I mean will the result be polygonal surface so I can see tiny polygons on their surfaces too ? So can someone explain it a bit ?