Plywood is a material manufactured from thin layers or “plies” of wood veneer that are glued together with adjacent layers having their wood grain rotated up to 90 degrees to one another.In structural terms, plywood can be used for partitions, floors, ceilings and sheathing. It is also used for decorative purposes both in exterior positions, such as cladding and doors, and internally as cabinets, shelves and furniture.