Open the following demo saved as BasicAnimation/demos/FrameByFrame-car.fla. You will find that a car is being animated across the screen. Every 5 frames or so, the car moves farther down the road. If you scrub the playhead (or just press Enter/Return) you will find the animation is pretty jumpy.
To make the quality of the animation better, you could add a keyframe to every frame, but that will mean you will need to position the car in many different positions along the way, still creating a choppy animation. It would be very difficult to position each one accurately to create smooth motion. Luckily, Flash can help with these animations using Motion Tweens. We will look at Motion Tweens in the next demo.