Welcome to the world of electronics! At its heart, every electronic circuit, from the simplest light switch to the most complex computer, relies on two fundamental concepts: signals and switches. Signals are the language that circuits use to communicate, while switches are the gatekeepers that control the flow of that communication. This guide will break down these two essential topics in a simple, step-by-step way for any new student. As we will see, a signal “not only carries information but it also represents the condition of the circuit.”