Veneer is a thin layer of wood, typically less than 3 millimeters thick, that is glued onto core panels to produce flat panels such as doors, tops, and panels for cabinets. It is often made from high-quality hardwoods, allowing manufacturers to create aesthetically pleasing surfaces while using less expensive materials underneath. Veneer can also be used in furniture making and interior design, providing a decorative finish that mimics solid wood. This technique is popular because it is cost-effective and environmentally friendly, as it maximizes the use of valuable timber resources like oak and walnut.