Radio

Radio is a technology and medium that uses electromagnetic waves to transmit and receive audio content, primarily music, news, and entertainment. It operates by converting sound into electrical signals that are modulated onto carrier waves, which can travel over various distances. Radio can be broadcast via AM (amplitude modulation) or FM (frequency modulation) frequencies, and is received by radios, which demodulate the signals back into sound. The term also encompasses various formats, including live radio shows, podcasts, and internet radio. Radio has played a significant role in communication and cultural exchange since it became widely accessible in the early 20th century.