The Key frame reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Key frame

In animation, a key frame is a frame in an animated sequence of frames that was drawn or otherwise constructed directly by the user rather than generated automatically, e.g. by tweening.

In video compression, a key frame or I frame is a frame encoded without reference to any images in another frame.

In non-linear digital video editing, a key frame is a frame used to indicate the beginning or end of a change made to the signal. For instance, a key frame could be set to indicate the point at which audio will have faded up or down to a certain level.

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