AM/FM broadcasting refers to the transmission of audio content through radio waves. AM, or Amplitude Modulation, varies the strength of the signal to convey sound, while FM, or Frequency Modulation, changes the frequency of the signal. Both methods allow radio stations to reach listeners over long distances. Radio stations use specific frequencies to broadcast their programs, which can include music, news, and talk shows. Listeners can tune in using a radio receiver, which decodes the signals into sound. This technology has been a popular form of entertainment and information since the early 20th century.