Car stereo refers to the audio system installed in the car. The reason why car stereo can be called audio, the most basic condition is to have the function of playing back sound.
A car stereo, also known as a car radio or car audio system, is an electronic device installed in a vehicle to play music, audio, and other content. It usually includes a radio tuner, a CD or DVD player, and an amplifier to boost the audio signal. Some car stereos come with additional features, such as Bluetooth connectivity, USB ports, and navigation systems.
Car audio is usually installed on the dashboard of the vehicle and controlled by the head unit, which is the main interface of the system. The head unit is used to adjust the volume, change the audio source, and access other functions of the car stereo. The head unit is also where the CD or DVD player and navigation system are located.