Alright kiddo, a Korean cannon is a big metal tube that shoots out explosions. Imagine a big, long straw that you blow really hard into, except it shoots out really big and powerful explosions instead of air.
This cannon was used a long time ago in Korea by soldiers during battles to protect themselves and also attack the enemy. They would fill the cannon with gunpowder, light it up with a match, and BOOM! The explosion would shoot out of the cannon.
But the Korean cannon wasn't just a simple metal tube. It had different parts that helped it work properly. There was the carriage part that held the cannon and allowed it to move around on wheels. There was also a breech part where the gunpowder would be loaded from. And then there was the barrel part, which is the long metal tube where the explosive would shoot out from.
The Korean cannon was a really important weapon back then because it could cause a lot of damage and help win battles. But it was also super loud and could be dangerous if not used properly. So it was very important to have trained soldiers who knew how to use the cannon safely and effectively.