Adobe Flash: Tweening
Tweening—creating motion in an animation.
Insert or draw a graphic on a separate layer in Flash timeline.
Right click on your graphic symbol and select create motion tween.
Now click and drag your graphic symbol to create a motion tween.
You can view your motion by going into the timeline and moving the scrubber brush across the frames you created.
You will notice a black diamond at the end of the frame. Otherwise known as a keyframe, this black diamond denotes when the motion will stop.