Upholstery is the work of providing furniture, especially seats, with padding, springs, webbing, and fabric or leather covers. The word also refers to the materials used to upholster something.
A New England easy chair with its upholstery sectioned
Armchair, designed in 1869 by George Jacob Hunzinger and patented on March 30, 1869. Wood, original upholstery. Brooklyn Museum
An upholstered chair ready to be covered with the decorative outer textile.
Leather-upholstered car seats
A chair is a type of seat, typically designed for one person and consisting of one or more legs, a flat or slightly angled seat and a back-rest. It may be made of wood, metal, or synthetic materials, and may be padded or upholstered in various colors and fabrics.
Chair, c. 1772, mahogany, covered in modern red morocco leather, height: 97.2 cm, Metropolitan Museum of Art (New York City)
The Coronation Chair, c. 1300
The Monobloc chair is a lightweight stackable polypropylene chair, usually white in colour, often described as the world's most common plastic chair.
Metal chairs in the Tuileries Garden, Paris, France