A fuse is like a birthday candle that you light up with a match or lighter. But instead of giving you a wish or a cake, the fuse is used to cause an explosion. When you light the fuse on explosives like fireworks or bombs, it burns slowly until it reaches the explosive material. This triggers a chemical reaction that causes a big explosion. It's like the fuse sets off a chain reaction of fireworks in the sky, but instead of pretty lights, it can do serious damage if not used safely. That's why only trained adults should handle explosives and use fuses to make sure everyone stays safe.