Easing shapes how an animated value speeds up or slows down over the course of a transition.
The same route can feel very different
Imagine a caption sliding into view. At constant speed it can feel mechanical; with a gentle start and finish it can feel more deliberate. Ease-in starts slowly and accelerates. Ease-out slows toward the end. Ease-in-out combines both. The endpoints and duration can remain identical while the experience of the movement changes.
Timing and path are separate choices
An easing curve often changes progress along an existing path. It does not necessarily bend the path itself. Some curves overshoot, bounce or reverse briefly; that behaviour is designed, not automatically a physical simulation. If a digital object must remain within a painted border, an overshoot can take it outside even though both endpoint positions are inside.
Use motion to help the visitor follow
For an artwork in Painta, a restrained ease can make the arrival of a detail easier to notice without distracting from the physical work. Keep a deliberate pause where someone needs time to read. Test the exported animation because an authoring tool’s named easing preset may be baked into samples rather than preserved as the same editable curve in the delivery file.