Radio signals are a type of electromagnetic radiation that can travel through the air and space. They are used for communication, broadcasting, and navigation. These signals are generated by devices like radio transmitters and can carry information such as music, voice, or data over long distances. The frequency of radio signals determines their properties and uses. Lower frequencies are used for AM radio, while higher frequencies are used for FM radio and television broadcasts. Antennas are essential for both transmitting and receiving these signals, allowing devices like radios and cell phones to connect and communicate effectively.