Radio is a form of wireless communication that uses electromagnetic waves, known as radio waves, to transmit and receive information such as sound or data through the air. It was one of the earliest technologies that allowed people to communicate over long distances without the need for physical wires. A radio device can pick up signals sent from radio stations, allowing listeners to hear music, news, and other programs. The invention of radio revolutionized the way people shared information and entertainment, making it a powerful tool for communication, especially before the rise of television and the internet. Today, radio remains widely used, both in traditional AM/FM broadcasting and in modern digital forms such as internet radio and satellite radio.