Radio

Radio is a technology that uses electromagnetic radiation to transmit and receive audio content over varying distances. It operates by converting sound into electrical signals, which are then modulated onto radio waves for broadcast. These waves travel through the atmosphere and can be received by radio receivers, which demodulate the signals back into sound.

Radio can refer to both the medium of transmission and the device that receives and plays the content. It encompasses various formats, including AM (Amplitude Modulation) and FM (Frequency Modulation), as well as digital radio. Radio is used for different purposes, including entertainment, news broadcasting, emergency communications, and public service announcements. It has played a significant role in mass communication since its invention in the early 20th century and remains an integral part of modern media.