What is the definition of European Front?

ETO, European Theater of Operations; PTO, Pacific Theater of Operations; CBI, China, Burma, India Theater of Operations. Europe had to MAIN Fronts; Western Allied Front (British/US) and the Russian (Soviet) Front. The Russian Front was Germany's main enemy and main threat. Germany was desperate to stop the Russians, as they showed no mercy to the Germans (retaliation). When they could, Germans surrendered to the Western Allies instead of the Soviets (Russians).