A clipboard is a thin board with a large (usually metal) clip at the top. Clipboards are a little larger than a piece of paper. They are used to support paper with one hand, while writing on the paper with the other hand. Clipboards are often used in situations where a person may not be able to find a good writing surface.
Clipboards can be made of many things. Most clipboards are made of masonite or particleboard, two types of wood. They can also be made from aluminum, steel, or acrylic, which is a type of plastic.