In animation, the act of creating a series of frames "in between" two key frames. In conventional (i.e., manual) animation, the professional animator draws the key frames, while assistants usually draw the frames in between them, the in-between frames comprising the movements of an animated object required to have it move from the point in the first key frame to the point in the second key frame. For example, the first key frame of a sequence may involve a whole egg on a table, while the second key frame may have a broken egg on the floor beneath the table. The in-between frames would then involve all the individual frames needed to have the egg roll off the table and break. Many computer-animation programs will automatically create in-between frames. Also referred to as tweening.
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