Gentlemen, pardon my ignorance on cars.

What is AWD (all wheel drive??)
what what does that mean?

I owned a toyota 4runner before and had to shift a gear to turn the car into 4x4

All wheel drive means that the car has power, track and motion on all 4 wheels at all times??? no need for a gear selection ?

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My Garage:
BMW 2006 X5 3.0i, Olivine Metallic
Toyota 2002 Corolla
Honda SuperBike CBR 600 F4i