What is Signal System?

A signal system is like a special language that helps things talk to each other without actually speaking.

Imagine you're playing with your toy train set. You push a button on the control panel, and poof, the train starts moving! That button is part of a signal system. It sends a message to the train, telling it what to do.

Think of a signal system like a friend who whispers messages to someone else so they know when to move or stop. In real life, traffic lights use a signal system, the red light says "stop," and the green light says "go."

Without signal systems, everything would be confused! Imagine if your toy train didn't know when to start or stop, it might crash into another train or go off the track. Signal systems keep things organized and working smoothly, just like how a teacher uses hand signals to tell students when to quiet down.