Action Editor

While the Dope Sheet mode lets you work with keyframes of all animation in the scene at the same time, the Action Editor mode focuses on the keyframes inside a single action.

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The Action Editor.

Actions are Blender's container for animation data. Objects and other animatable data-blocks reference actions to get animated by the animation data inside. Data-blocks can reference one action as their active action and additional actions through Nonlinear Animation tracks.