Radio signals are a type of electromagnetic radiation that can travel through the air and space. They are used for communication, allowing information to be transmitted over long distances without the need for physical connections. Devices like radios, televisions, and cell phones rely on radio signals to receive audio and visual content. These signals are generated by transmitters and can vary in frequency and wavelength. Lower frequency signals can travel farther and penetrate obstacles better, while higher frequency signals carry more data but have a shorter range. This versatility makes radio signals essential for various applications, including broadcasting, wireless networking, and satellite communication.