Radios are devices that receive and transmit electromagnetic waves, allowing for the communication of audio signals over distances. They have been a vital part of communication technology since their invention in the late 19th century, evolving from simple crystal sets to complex digital receivers. Radios can be found in various forms, including AM, FM, and digital formats, catering to different listening preferences. In addition to traditional broadcasting, radios play a crucial role in emergency communication and public safety. They are used in vehicles, homes, and portable devices, making them accessible to a wide audience. The versatility of radios continues to make them relevant in today's digital age, where they complement streaming services and podcasts.