A radio tuner is a device that allows users to select and listen to radio stations. It works by tuning into specific frequencies, enabling the reception of AM (Amplitude Modulation) and FM (Frequency Modulation) signals. Radio tuners can be found in various devices, including standalone radios, car stereos, and home audio systems. Modern radio tuners often come with digital displays and presets for easy access to favorite stations. Some advanced models also include features like RDS (Radio Data System), which provides additional information such as song titles and artist names. Overall, radio tuners play a crucial role in accessing live audio broadcasts from various sources.