Drilling is a way to make a hole in something. Just like when you use a pencil to make a hole in a piece of paper, drilling makes a hole in something harder like metal, wood or rock.
To drill, you need a tool called a drill. It's a special tool that has a pointy end and it spins around really fast when you turn it on.
You put the pointy end on the thing you want to make a hole in and press down gently while the drill is spinning. This makes the drill bit spin faster and start making a hole in the material.
As you drill, the drill bit cuts away tiny pieces of the material and pushes them out of the way. This creates a hole that is the same size as the drill bit.
Drilling is useful for lots of things, like making holes in walls to hang pictures, making holes in wood for screws, or drilling into the ground to find water or oil. But always be careful when using a drill, because it can be dangerous if you don't use it properly.