Today, you are going to learn all about relay systems, such as what they are, and when we use them. Hopefully, by the end, you will have a pretty good understanding of a relay system. Let’s start by talking about what a relay actually is. According to Merriam-Webster, a relay is, “an electromagnetic device for remote or automatic control that is actuated by variation in conditions of an electric circuit and that operates, in turn, other devices (such as switches) in the same or a different circu