Signal systems are methods used to convey information through various forms of signals. These signals can be visual, auditory, or even tactile, and they help people communicate effectively. For example, traffic lights are a simple signal system that uses colors to indicate when to stop or go, ensuring safety on the roads. In more complex scenarios, such as in telecommunications, signal systems involve the transmission of data over distances using electrical signals. Devices like smartphones and computers rely on these systems to send and receive information, allowing us to connect with others instantly, no matter where they are in the world.