Radio is a technology that uses electromagnetic waves to transmit sound or data through the air. A transmitter encodes audio into radio waves, and a receiver (radio set) decodes and plays the sound.
Common types include AM (Amplitude Modulation), FM (Frequency Modulation), shortwave, satellite radio, and internet radio.
AM varies the amplitude of the signal and has longer range but lower sound quality. FM varies the frequency, offering better sound quality but shorter range.
Yes, radio remains popular worldwide for music, news, talk shows, and emergency broadcasting, though streaming and podcasts have grown.
