In communication, the relay system plays a vital role in enhancing signal transmission and network coverage. One of the most common applications is in wireless networks. Relay nodes or devices, such as Wi-Fi extenders or repeaters, help to extend the coverage area of wireless signals. These devices work by receiving a weak signal from the primary router and then amplifying and rebroadcasting it to areas with poor coverage. This is particularly useful in large buildings, factories, or outdoor spaces where signal attenuation can occur due to walls or environmental factors.