What are the key points in the action called? transitions sequence keys movement key frames

The answer is Keyframe.  It refer to the first and last frames of an action.  A keyframe is a drawing that decides the starting and ending points of any smooth transition. Their position in time is measured in frames on a strip of film. A sequence of keyframes describes which movement the viewer will see, whereas the position of the keyframes defines the timing of the movement.

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