Radio broadcasting transmits audio programs via radio waves. One transmitter sends. Many receivers listen. It is a one-to-many model. AM and FM are the traditional bands. Digital radio is growing. Radio reaches places that television and internet do not. It is the most accessible broadcast medium.

Radio broadcasting began in the 1920s. KDKA in Pittsburgh was one of the first commercial stations. It became the primary source of news and entertainment. Families gathered around the radio. It connected nations during wartime. It still reaches billions today.

Radio broadcasting bands

• AM: medium wave, long range, lower quality
• FM: VHF, shorter range, better quality
• Shortwave: long distance, international
• Digital: DAB, HD Radio, satellite

Radio is resilient. It works when the internet is down. It reaches rural areas and developing countries. It is cheap to receive. A simple receiver costs a few dollars. Radio is not dead. It is just less dominant. It remains essential for emergency communication and public information.