At its core, communication relay refers to the process of transmitting signals from one point to another using an intermediary device or system. The relay functions as a bridge between two devices or networks that are not directly connected. The intermediary device, or relay station, receives the signal, processes or amplifies it if necessary, and then retransmits it to its destination. This process can be either analog or digital, depending on the system and technology involved.

    Relays are used in a wide variety of communication systems to ensure that signals travel efficiently over long distances or through obstacles. The use of relays significantly enhances the coverage, range, and reliability of communication networks, making them indispensable in modern communication technologies.