Brakes are mechanical devices used in vehicles to slow down or stop their movement. They work by creating friction, which converts the vehicle's kinetic energy into heat. Most vehicles use either disc brakes or drum brakes, each with its own design and function. When the driver presses the brake pedal, it activates the braking system, which applies pressure to the brake pads or shoes. This action slows the wheels, allowing the vehicle to decelerate safely. Regular maintenance of brake pads, brake fluid, and brake rotors is essential for optimal performance and safety.