Tracking shot
In motion picture terminology, the term tracking shot may refer to a shot in which the camera is mounted on a camera dolly, a wheeled platform that is pushed on rails while the picture is being taken; in this case the shot is also known as a dolly shot or trucking shot. One may dolly in on a stationary subject for emphasis, or dolly out, or dolly beside a moving subject (an action known as "dolly with").