Key frames in animation represent the starting point, and the ending of of a movement. in certain types of animation, for example flash, a motion tween s created between the first and last points. this does also happen in 3d animation , however only the first and last points are shown. The positions of key frames in the sequence will show the timing of the specific movement, and the distance between frames will determine the speed of the animation/movement.
Key frames can be copied and pasted to help line up the position of objects n the scene. one effect that i find useful in flash animation is onion skin. when a new frame is added, the onion skin will show a faded copy of the previous frame so that it becomes easier to line up objects.
Example of key frames with a motion tween.
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