BEVs (Battery Electric Vehicles):
This is a 100% electric vehicle powered only by the electrical energy in the battery. You charge a BEV by plugging the car into an electrical socket, and it also stores energy generated when you brake.
PHEVs (Plug-in Hybrid Electric Vehicles):
These cars contain two motors – an electric one with a battery that can be charged from a socket, and an internal combustion engine, the same as a normal car.
Hybrid vehicles are filled with petrol/diesel and this fuel charges the electric battery, along with regenerative braking, for use when the car pulls away from a stop or during heavy acceleration.