In today’s world of advanced technologies, relays play a crucial role in various fields, especially in networking and automation systems. A relay is an electrical switch that opens or closes contacts to control circuits, enabling remote switching, electrical isolation, and protecting sensitive components from electrical overloads. The evolution of relay technologies has brought about a wide variety of types, each designed for specific applications. In this article, we will explore different types of relays, comparing their functionalities, advantages, and disadvantages, specifically focusing on electromagnetic relays, solid-state relays, and network relays.