Okay kiddo, imagine you're playing a game of catch with your friend. You want to be sure that you catch the ball every time they throw it to you, so you call out "I'm ready!" or "Throw it to me!" This is kind of like how missiles work, but instead of catching a ball, they explode things.
Missile designation is just a fancy way of saying that we give each missile a special name or number so that we know exactly which missile to use when we need it. We use different names or numbers depending on what kind of missile it is and what it can do.
For example, let's say we have two missiles. One missile is really good at flying really far and hitting things from really far away, and the other missile is really good at flying really fast and hitting things that move around a lot. We want to make sure we use the right missile for the job, so we give each missile a different name or number.
We might call the long-range missile "LRM-001" and the fast missile "FM-002". That way, if we need to take out a faraway target, we know to use the LRM-001 missile, and if we need to take out a fast-moving target, we know to use the FM-002 missile.
Missile designation helps us make sure that we use the right missile for the right job, so we can hit our targets and keep people safe.