<human>: Can you tell me about the different types of wood?
<bot>: Wood is made up of cellulose and lignin, which are both organic compounds. Cellulose is a polysaccharide found in plants and animals, while lignin is a complex polymer that gives wood its structure. There are three main types of wood: softwood, hardwood, and plywood. Softwood is typically lighter in color than hardwood, but harder to work with due to its lower density. Hardwood is denser and more durable than softwood. Plywood is made from layers of wood veneers bonded together with glue. It’s stronger than regular lumber, but less flexible.