A radio is a device that receives electromagnetic waves (radio signals) and converts them into sound. It works by tuning into specific frequencies transmitted by radio stations.
Traditional AM/FM radios do not need the internet; they use radio waves. However, internet radios and some smart devices do require a Wi-Fi connection.
Signal clarity depends on the broadcasting frequency, the quality of the transmitter, and how close the listener is to the transmission tower. FM usually provides clearer sound than AM.
Regular AM/FM radios usually only pick up local stations. To access international broadcasts, you need a shortwave radio or an internet radio.