human
Can you tell me about the different types of wood?
assistant
Wood is a natural material made up of cellulose fibers and other organic matter. It can be classified into two main categories: hardwood and softwood. Hardwood, such as oak, mahogany, cherry, and walnut, contains more lignin than softwood, which includes pine, spruce, and fir. Lignin makes hardwood harder, denser, and more resistant to rotting than softwood. Hardwoods are generally heavier and have a higher density, making them ideal for furniture and construction materials. Softwood is lighter in weight and has a lower density, making it better suited for paper, plywood, and other lightweight products.