Okay kiddo, do you know what explosives are? They're things that go boom and make big explosions. Dunnite is a type of explosive that was invented a long time ago by someone named Alfred Nobel. You might have heard of him before, he's the guy who invented dynamite.
So imagine you have a little toy car and you want to make it go really fast. You can put a battery in it to make the wheels spin, but what if you want it to go even faster? You could put a small amount of dunnite in the car and when you light it on fire, it will make a big explosion that pushes the car forward really fast.
But remember, explosives are very dangerous and can hurt people if they're not used carefully. That's why only trained professionals should work with dunnite and other explosives.