A hybrid vehicle combines two or more sources of power to be able to function. The most common hybrid engine uses traditional internal combustion engine with an electric motor; this is a hybrid electric vehicle (HEV). There are, however, several other types of onboard energy systems a hybrid car or truck can employ, including (but not limited to) the following:
Hybrid vehicles should not be confused with full electric vehicles, which run solely on an on-board rechargeable battery system.