Perhaps if you had used the search function thoroughly you would find varying information on drive-wheel terminology. To wit: Recently some new "automatic" AWD systems have emerged. Fancy names like "Real Time 4WD", "intelligent AWD" or "active AWD" are hiding the fact that they are essentially sophisticated 2WD systems. Automatic asymmetric AWD would be the best term for them. Unfortunately, since they offer AWD only part of the time, some magazines have now called it "part time 4WD" - but that term has been used since WW II for cars like the Willys and Jeep Wrangler and their part time 4WD - the name coming from the fact that 4WD can only be used part of the time (when off-road), most of the time they have to operate in 2WD (on-road). Automatic asymmetric AWD is much less capable in off-road settings than full time AWD systems and inferior to full time 4WD. However, automatic asymmetrical AWD is becoming more and more sophisticated and offers pretty much everything consumers expect for everyday (pavement) driving