An easing curve maps time onto progress. On a graph with elapsed time along the bottom and distance travelled up the side, a straight diagonal is linear; a curve that rises steeply and flattens is an ease-out; one that starts flat and steepens is an ease-in. In CSS this is expressed as a cubic Bézier en.wikipedia.org with four numbers, and the named keywords (ease, ease-in, ease-out, ease-in-out) are just preset values of those four.
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