What do FM and AM mean in cars?

[DelTaylor]

FM and AM in cars refer to the AM and FM bands on car radios, which are used for listening to domestic broadcasts. AM usage: AM is a radio band with relatively low sound quality because it uses medium waves. It can be reflected by the atmosphere and diffract around obstacles, allowing for long-distance transmission. It is typically used for interprovincial radio stations. FM advantages: FM is a shortwave band with good direct propagation performance, but it cannot bypass obstacles. Therefore, FM is only suitable for short-distance transmission, and the FM stations you usually hear are local city radio stations. FM offers better sound quality and can also support dual-channel stereo.