Audi Quattro logo represents their all-wheel drive system.
Although there are a variety of ways to say it, 4x4 is the quickest way for a manufacturer to tell you that you have four wheel drive.
Four-wheel drive, 4WD, or 4x4 ("four by four") is a four-wheeled vehicle with a drivetrain that allows all four wheels to receive torque from the engine simultaneously.
The term four-wheel drive describes truck-like vehicles that require the driver to manually switch between two-wheel drive mode for streets and four-wheel drive mode for low traction conditions such as ice, mud, snow, slippery surfaces, or loose gravel.
All-wheel drive (AWD) is often used to describe a "full time" 4WD that may be used on dry pavement without destroying the drivetrain (It should be noted that "Full-Time" 4WD can be disengaged and the center differential can be locked, essentially turning it into regular 4WD. On the other hand, AWD cannot be disengaged and the center differential cannot be locked), although the term may be abused when marketing a vehicle.
AWD can be used on dry pavement because it employs the use of a center differential, which allows each tire to rotate at a different speed. This eliminates driveline binding, wheel hop, and other driveline issues associated with the use of 4WD on dry pavement. With vehicles with more than four wheels AWD means all wheels drive the vehicle, to varying degrees of engagement, while 4WD means only four of the wheels drive the vehicle continuously.
Powering all four wheels provides better control in normal road cars on many surfaces.
In some mechanic circles the term "4 by 4" also denotes the number of drive wheels and the number of speeds the car has, so the term "5 by 4" would denote an automobile with 5 speeds and 4 drive wheels.
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