This beautiful furniture is made in three types of materials. First is ply, second is laminate and third is veneers. And price varies according to the wood and finishing. A bunk bed is a type of bed in which one bed frame is stacked on top of another, allowing two or more beds to occupy the floor space usually required by just one. A ladder is used to get to the upper bed, which is normally surrounded by a railing to prevent the sleeper from falling out.