This document discusses classic tween animation in Flash. It defines a tween as animating between two objects to make the first object evolve smoothly into the second. Specifically, classic tween animates an object by changing its position, scale, or rotation. The document provides steps to create a classic tween, including drawing an object, inserting keyframes on frames 1 and 30, and creating a classic tween between the frames to move the object from one side of the stage to the other.