Have you ever blown bubbles with your bubble wand? When you blow bubbles, they start off small and then get bigger and bigger until they pop or deflate. A blast bomb is kind of like blowing a giant bubble filled with air that goes BOOM when it pops!
Instead of using a bubble wand, people use an explosive material to create the blast bomb. The explosive material is put into a container, which can be made of metal or plastic. The container also has a fuse, which is like a little string that can be lit on fire. When the fuse burns down to the explosive material, BOOM! It creates a really loud and powerful explosion.
Blast bombs are used for a lot of different things, like in movies or on TV to make big explosions for special effects, or by firefighters to create controlled blasts that can help put out forest fires. But it's important to remember that blast bombs can be really dangerous if they're not used carefully and responsibly.