You can download the example files to this article here.
The below example shows three balls animating along the same distance over the same time.
Ball 1 is the most basic of animations going back and forth from A to B at a constant speed. Although this is a required function it often leaves animations a little lifeless and robotic.
The ‘easing’ feature in Blend allows us to add acceleration or inertia to an animation. In other words, instead of a constant speed we can make an object speed up and slow down during its path while still taking the same time to reach its destination. This effect can really bring animations to life, mimicking how objects work in real life.