Easing controls the velocity profile of the animation between two keyframes. Without easing, motion has constant speed (Linear interpolation). With easing, motion accelerates and decelerates in ways that feel natural, physical, or expressive.
The easing is applied per keyframe transition — the transition from Keyframe A to Keyframe B can have different easing than the transition from B to C.
Via Properties Panel: Select one or more keyframes. In the Properties Panel (or the Easing panel), choose from the easing presets or edit the custom bezier.
Via Right-click: Right-click any selected keyframe(s) and choose from the easing preset submenu.
Via the Easing dropdown in the timeline: Each keyframe shows a small easing indicator. Click it to open a quick-select dropdown.
Easing on a keyframe applies to the outgoing transition — from this keyframe to the next one. The easing of the incoming transition is controlled by the previous keyframe.
For natural motion: