An office chair is a chair designed for use at a desk in workplaces, homes, or study areas. It is usually adjustable and made for comfort during long periods of sitting. Most office chairs have a padded seat, back support, wheels for movement, and a swivel base that allows the user to turn easily. Some models also include armrests, height adjustment, reclining features, and ergonomic support to improve posture and reduce strain on the body.