Layouts can roughly be divided into three categories: front-wheel drive, rear-wheel drive and four-wheel drive. Many different combinations of engine location and driven wheels are found in practice, and the location of each is dependent on the application for which the car will be used.
The front-engine, front-wheel-drive layout (abbreviated as FF layout) places both the internal combustion engine and driven wheels at the front of the vehicle. This is the most common layout for cars since the late 20th century.
Some early front-wheel drive cars from the 1930s had the engine located in the middle of the car.
A rear-engine, front-wheel-drive layout is one in which the engine is between or behind the rear wheels, and drives the front wheels via a driveshaft, the complete reverse of a conventional front-engine, rear-wheel-drive vehicle layout. This layout has only been used on prototype and concept cars.