Eases with a relatively low power either at the beginning (easeIn), the end (easeOut), or both (easeInOut). Sine is a convenience class that congregates the 3 types of Sine eases (SineIn, SineOut, and SineInOut) as static properties so that they can be referenced using the standard synatax, like Sine.easeIn, Sine.easeOut, and Sine.easeInOut.
GreenSock Docs (HTML5/JS)
Sine
