Animation is important in mobile because we want our apps to feel alive. When you interact with your phone what you’ll notice is that there is movement in response to your actions. The response you get is not always necessary to the functionality of the app. Sure, there’s scrolling but maybe the content also bounces or stretches as you reach the edge of a page. Maybe the part beneath your finger lights up or tilts to one side as if you are putting weight on it. If there were no movement how would it feel? It would feel frozen or dead. All of these non-imperative movements we’ll lump together into animation, and we know why animation is important.