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; however, a chair can have three legs or could have a different shape. 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).