A hybrid car is a passenger vehicle that is driven by a hybrid engine, which is any engine that combines two or more sources of power, generally gasoline and electricity. There are two types of gasoline-electric hybrid cars; the parallel hybrid, and the series hybrid. Both use gasoline-electric hybrid technology, but in radically different ways.
In a parallel hybrid car, a gasoline engine and an electric motor work together to move the car forward, while in a series hybrid, the gasoline engine either directly powers an electric motor that powers the vehicle, or charges batteries that will power the motor. Both types of hybrids also use a process called regenerative braking to store the kinetic energy generated by brake use in the batteries, which will in turn power the electric motor.