To laminate is to build up a rigid surface over a framework by applying layers of the same material, adhering them to each other. In essence, any material that is made by sticking together several layers of the same material is considered as laminated. Plywood is a laminated product, the wood grain going in a different direction with each layer in order to add strength. Corrugated cardboard and foam core (or foam board) are also laminated materials. Lamination is also a process of reinforcing fragile old paper, usually with thin, translucent or transparent sheets.