A one-way radio is a communication device that allows users to send audio signals without receiving any back. This type of radio is commonly used in situations where immediate feedback is not necessary, such as in emergency broadcasts or public announcements. The sender transmits a message, and the audience listens without the ability to respond directly. One-way radios are often used by organizations like emergency services and broadcasting companies to relay important information quickly. They can operate on various frequencies and are designed for clear audio transmission, making them effective for reaching large groups of people in real-time.