Stagnation pressure is like when you go on a slide (like at a water park) but instead of going down, you go up and hit a wall really hard. When you hit the wall, the air that's trying to push you forward stops and gets squished.
The squished air becomes really strong and makes a lot of pressure. This pressure is called stagnation pressure. It's like when you try to push someone but they don't move, so you push harder and harder, and eventually you're pushing really hard but not actually moving them.
In science, we use stagnation pressure to measure how much pressure the air makes when it stops moving and gets squished. We use this when we design airplanes or cars to make sure they can handle the pressure from hitting a wall of air.
So, stagnation pressure is like when air stops and gets squished, making a lot of pressure. We use it to make sure things can handle pressure when they hit a wall of air, kind of like going up a slide and hitting a wall.