A lumber yard is a place where people keep and sell pieces of wood that you can use to build things like houses, furniture or even toys! Imagine a big outdoor store with lots of different types of wood stacked together. When you go there, you can pick out pieces of wood that are the right size and shape for your project. Some of the wood might be really big and heavy, while other pieces might be small and easy to carry. Once you know what you need, you can buy the wood and take it home to start building! Lumber yards are like the candy store for people who love to build things with wood!