4 x 4 (4WD) - Describes a vehicle with four-wheel drive. The first figure is the number of wheels. The second is the number of powered wheels.

All-Wheel Drive (AWD) - A full-time single-speed system designed to supply drive power to all four wheels. The percentage of front/rear power delivery varies from system to system.

Automatic Four-Wheel Drive (A4WD) - This type of drive system automatically engages 4WD as needed. When internal monitors sense differences in individual wheel speeds, indicating that a tire is slipping, then 4WD is automatically engaged.

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