Panning; To pan;
Taking a photograph or series of photographs while rotating a camera horizontally or vertically while keeping a moving subject in view. In still photography the use of the term usually refers to the act of panning. The pan aims to capture a moving object in sharp definition while the background is blurred thus imitating what the eye would see if following a moving object.
Panning requires a specific technique of rotating the camera to follow the moving object. In a properly panned shot the photographic subject(s) that is being tracked is normally sharp while the rest of the picture is blurred by the movement.