A hybrid car has a gas engine and an electric motor. The motor gets you moving and helps when you speed up; the engine takes over at cruising speed. When you brake, the wheels drive the motor, which works as a generator to recharge the battery. The engine tops it up too, so a regular hybrid never needs plugging in.
In this model you can watch all five moments that matter: pulling away on electricity alone, cruising on the engine, accelerating hard with both working together, braking to refill the battery, and the engine switching off at the lights. Turn on Cutaway to slice the engine open, or open What if… to press the accelerator yourself and see which power source takes over.