Chair concept
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.
A chair without a back or arm rests is a stool,[4] or when raised up, a bar stool.[5] A chair with arms is an armchair[6] and with upholstery, reclining action and a fold-out footrest, a recliner.[7] A permanently fixed chair in a train or theater is a seat[8] or, in an airplane, airline seat;[citation needed] when riding, it is a saddle[citation needed] and bicycle saddle,[citation needed] and for an automobile, a car seat[citation needed] or infant car seat.[citation needed] With wheels it is a wheelchair[9] and when hung from above, a swing.[citation needed]
An upholstered, padded chair for more than one person is a couch, sofa, settee, or "loveseat";[10] or if is not upholstered, a bench.[11] A separate footrest for a chair, usually upholstered, is known as an ottoman,[12] hassock[13] or pouffe.[14]