Animation Base class for all TweenLite, TweenMax, TimelineLite, and TimelineMax classes, providing core methods/properties/functionality, but there is no reason to create an instance of this class directly.
 SimpleTimeline SimpleTimeline is the base class for TimelineLite and TimelineMax, providing the most basic timeline functionality and it is used for the root timelines in TweenLite but is only intended for internal use in the GreenSock tweening platform.