A chair is a piece of furniture with a raised surface commonly used to seat a single person. Chairs are supported most often by four legs and have a back;[1][2] however, a chair can have three legs or could have a different shape.[3] Chairs are made of a wide variety of materials, ranging from wood to metal, and they may be padded or upholstered, either just on the seat or on the entire chair (e.g., with a La-Z-Boy chair). Chairs are used in a number of rooms in homes (e.g., in living rooms, dining rooms and dens), in schools and offices (with desks) and in various other workplaces.