Ease (in/out) Function

[rmarier]

Can someone explain what is the Ease (in/out) function used for ?

It doesn't look like it's doing anything ... :-[

Perhaps a real life example?

[Hippani]

You can make a transition start slow and end fast or the other way around. Normally it's just steady. Like if you let go of a ball, it starts slow then speeds up.