Phase-of-firing code

Phase-of-firing code is like a signal that tells an object, like a gun, when to fire. It's like a secret code that one object needs to give to another object to make sure it knows when to do something. For example, imagine you are playing tag and you want to shoot your friend with a Nerf gun. The Nerf gun needs a signal or code from you to know when to shoot, so you can yell "fire" or hold up your hand for the gun to see. That's kind of like the phase-of-firing code.