Regenerative braking is a technology used in electric vehicles and hybrid cars to recover energy that would otherwise be lost during braking. When the driver applies the brakes, the electric motor that usually drives the vehicle acts as a generator, converting kinetic energy back into electrical energy. This energy is then stored in the vehicle's battery for later use. This process not only improves the vehicle's efficiency but also extends the driving range by reusing energy. Regenerative braking is an essential feature in many modern vehicles, including those from manufacturers like Tesla and Toyota, contributing to their overall sustainability.