There are different types of Hybrid Vehicle, the full hybrid, the micro hybrid and the mild hybrid.
The full hybrid is the most complex of all hybrid vehicles and are powered by both the electric and combustion engine. No emissions are produced when the car is travelling at a lower velocity but when the car is travelling a greater speed the combustion engine takes over. The hybrid car is equipped with sensors to let the engine know what fuel source to use. Some hybrid vehicles are also adapted so that the braking system can actually recharge the battery so energy is almost never wasted.
The micro hybrid vehicle, also known as 'Stop-Start', is not a fully fledged hybrid vehicle but the Stop-Start technology assists with a reduction in emissions when you stop at traffic lights or brake and remain in the same position for an extended period of time.
The two types of mild hybrid vehicles are series and parallel. The series hybrid moves the car by using a battery which is charged either by a fuel based engine or when the car is slowing down. The parallel hybrid uses 'Stop-Start' technology and it also uses the electric motor to assist the engine during acceleration. The parallel mild hybrid requires both sources; combustion and battery, to function.
A plug-in hybrid electric vehicle (PHEV) is a hybrid electric vehicle whose battery can be recharged by plugging it into an external source of electric power, as well by its on-board engine and generator.
If you're after a plug-in hybrid electric vehicle (PHEV) today, you're spoiled for choice. The sheer variety of vehicles that now offer plug-in hybrid ability means, there are PHEV options to suit buyers across the large and mid-size car markets. It also means that buyers have a tougher than ever time choosing the best plug-in hybrid car for them.