What is "office chair"

n. A chair that is designed for use at a desk in an office. It is generally comfortable and adjustable and can swivel 360 degrees.

An office chair, or desk chair, is a type of chair that is designed for use at a desk in an office. It is usually a swivel chair, with a set of wheels for mobility and adjustable height. Office chairs were developed around the mid-19th century as more workers spent their shifts sitting at a desk, leading to the adoption of several features not found on other chairs.