A TNT cannon is a device used to launch TNT blocks over long distances. It is typically made from a dispenser, a redstone circuit, and a TNT block. The dispenser is placed on the ground and the redstone circuit is connected to the dispenser. The TNT block is then placed in the dispenser. When the redstone circuit is activated, the dispenser will launch the TNT block.
TNT cannons can be used for a variety of purposes, such as attacking enemy bases, creating traps, or simply for fun. They can be very effective weapons, as they can launch TNT blocks over long distances with great accuracy. However, they can also be dangerous, as they can cause explosions that can damage property or injure people.