Okay kiddo, have you ever seen those cool action movies where there is an explosion that goes BOOM? That's what a shock tube detonator is for.
Imagine you have two rooms with a door in the middle. In one room, you put explosive material (don't worry, this is just for imagining, we're not actually doing this). In the other room, you put a gas that you don't want to mix with the explosive material. Maybe it's a poisonous gas or something.
Now let's say you want to set off the explosive material, but you don't want to open the door and risk the gas from the other room coming in. That's where the shock tube detonator comes in.
The shock tube detonator is like a very, very fast straw. You attach one end to where you want the explosion to happen (the explosive material) and the other end to a device that will ignite the shock tube. When the device ignites the shock tube, it sends a shock wave through the tube that is so strong, it travels through the door and into the other room.
When the shock wave hits the gas in the other room, it ignites it and causes a small explosion in that room as well. But since the door was closed, the larger explosion from the first room doesn't mix with the gas in the second room, so it's safe.
So that's a shock tube detonator! It's like a straw that sends a big BOOM from one room to another without letting any dangerous stuff mix together. Pretty cool, huh? But remember, we're not actually doing this, we're just using our imaginations!