What is the purpose of chairs with wheels?

Office chairs have wheels because it enables the chair operator to move around quickly and efficiently. Castor wheels are usually set into a '5 star base' to give the best support and balance, and are popular on 'operator' chairs, 'executive operator chairs', lab chairs and ergonomic chairs where the operator needs to perform different tasks in different parts of their working area.

A castor base also adheres to the ergonomic principle of supported, easy movement. Also to move around the room