Powertrain vs Drivetrain vs Driveline

Powertrain - From the engine, through the transmission, down the drive shaft and out to the wheels. All parts which make the car go down the road.

Drivetrain - Basically the same as the powertrain, sans the engine. You're talking about everything which makes the car go, except the engine.

Driveline — This is the drivetrain minus the transmission, meaning it includes only the driveline components