Okay kiddo, have you ever seen a tree? Of course you have! Well, a saw mill is a place where people cut down those trees and turn them into wood that we can use for all sorts of things like building houses or making furniture.
When the trees are first brought to the saw mill, big machines called saws are used to cut the trees into different sized logs. Then, those logs are cut even further into pieces of wood that are ready to be turned into something useful.
But it's not just cutting that happens at the saw mill. They also use big machines called planers that help smooth out the wood and make it ready for whatever it's going to be used for. Some wood might get turned into something like plywood, which is made by gluing layers of wood together.
Overall, the saw mill is a pretty incredible place where trees are turned into useful things that we use every day. And it's all thanks to the hard work of the people and the big machines that make it happen!