A PLANK is a prepared piece of wood that is usually rectangular in shape and has been cut to a specific length, width, and thickness. It is often used in construction, carpentry, and other projects. Planks are typically made from softwood or hardwood, such as pine, oak, or maple. They can also be made from composite materials, such as plywood or particle board. Planks are commonly used for flooring, walls, ceilings, and other structural elements.