MIG MAG and GMAW welding

What is the difference between MIG MAG and GMAW welding?

MIG: Metal Inert Gas Welding
MAG: Metal Active Gas Welding (pure CO2)
GMAW: Gas Metal Arc Welding )

GMAW is the official term for semi automatic welding and it covers the wide range of this type of process.

MAG is only different as in using active gas ( CO2 ) at 100% . Using pure CO2 is great for heat input and transfer of weld metal.