1. A symbol is an object that appears in your library that can be used multiple times on a stage.
An instance occur es only once on a stage, and you name its instance in order to manipulate it with action script.
2. It uses vector graphics easily, so it is scalable and resolution independent
3. A keyframe defines a section of frames and can help preform a function, frames
hold information but are not able to perform a function without a keyframe.
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