A can opener is a tool that helps you open cans. You know those metal cans that have yummy food like soup or fruit inside? Well, sometimes they can be really hard to open with your hands because they have a special dent around the top that keeps the lid on really tight.
That's where the can opener comes in! The can opener has a sharp blade that you place on the top of the can where the dent is. You turn a crank, which makes the blade go around and around, cutting through the metal as it goes. This lets you take the lid off and get to the yummy food inside!
It's important to remember to be very careful when using a can opener, though! The blade is very sharp and can hurt you if you're not careful. That's why it's a good idea to have an adult help you use it until you're big and strong enough to do it on your own!