The Four Wheel Drive Auto Company, more often known as Four Wheel Drive (FWD), was founded in 1909 in Clintonville, Wisconsin, as the Badger Four-Wheel Drive Auto Company by Otto Zachow and William Besserdich.

Four-wheel drive, 4×4 ("four by four"), 4WD, and AWD is a form of  drivetrain capable of providing power to all wheel ends of a two-axled vehicle simultaneously. It may be full-time (AWD), or on-demand (4WD/4×4), and may be linked via a transfer case to provide multiple gear ranges.