Known also as a motion blur, it is an effect used in animation indicating an object’s movement, it is also nothing but a streak left behind by a moving object.
You want an example? Look at the Road Runner, or rather at the blur, which is all that is left over. In the case of animation, a blur is created by a computer stimulation. Movement is our specialty. At Studio Pigeon we use it whenever we want the movement of our graphics to look as natural as possible.