A signal repeater is a device that receives a signal, amplifies it, and then retransmits it to extend the range of communication. This technology is commonly used in various fields, including telecommunications and broadcasting, to improve signal strength and quality over long distances. Signal repeaters are essential in areas where the original signal may weaken due to obstacles like buildings or terrain. They help maintain a strong connection for devices such as cell phones, Wi-Fi routers, and television broadcasts, ensuring users can communicate effectively without interruptions.