A parking brake, also known as a handbrake or emergency brake, is a device in vehicles designed to keep the car stationary when parked. It is typically engaged by pulling a lever or pressing a pedal, which locks the rear wheels in place. This prevents the vehicle from rolling, especially on inclines. The parking brake is crucial for safety, as it ensures that the vehicle remains secure when not in use. In addition to its primary function, it can also be used in emergencies to slow down or stop the vehicle if the main braking system fails.