A saw is a tool that looks like a long, thin, metal or plastic thing with pointy teeth on one side. It can be used to cut things like wood or metal into smaller pieces. To use a saw, you hold onto the handle and move the teeth back and forth over the thing you want to cut. The teeth catch onto the material and create tiny sawdust pieces, eventually making a cut. It's important to be careful when using a saw, so make sure an adult is around to help you.