Expository writing is like telling someone how to do something or explaining how something works in a really clear way. Imagine you're trying to teach your little sister how to brush her teeth. You might explain step by step how to put toothpaste on the brush, how to brush each tooth, and how long to brush for. That's kind of like expository writing! It's writing that explains a topic or idea in a very organized and clear way, so that anyone who reads it can understand it easily. It might be used to explain how a machine works or to give a recipe for making a cake. Expository writing is all about being clear, detailed, and helpful to your reader.