A "Head Unit" is the central component of a car's audio system, responsible for controlling music playback, radio, and other media functions. It typically includes a display screen, buttons, and connectivity options like Bluetooth and USB ports. Head units can also integrate with smartphones, allowing users to access apps and navigation features directly from the car's interface. Modern head units often support various audio formats and may include features like equalizers and built-in amplifiers for enhanced sound quality. Some advanced models even offer touchscreen displays and compatibility with Apple CarPlay and Android Auto, making it easier to use mobile devices while driving.