A drum is like a big round bucket that you can use to store things. It's usually made of metal or plastic and has a lid that you can take off and put back on. It's called a drum because it kind of looks like a musical drum - you know, the kind that you hit with sticks? But instead of making music, this drum is used to store things like oil, chemicals, or even food. Sometimes, people use drums to transport things from one place to another. And just like how you have a toy box to keep all your toys in one place, a drum helps keep things organized and safe.