A symbol is a vector shape that is stored in your library. It is editable by double clicking it on your stage or in your library. They are small in file size and stored as part of your movie. An instance is a symbol, customized in the properties menu with a distinct "instance name." Editing it will only affect that instance. In any other scenario, editing any other instance of the symbol (with the same name) will affect all other instances of that symbol, making it easy to make big changes (like color, size, etc) to every iteration of your symbol in you flash movie.
2: What is difference between a frame that has an empty circle and a frame with filled in black circle?
A frame with an empty circle is an empty keyframe. A frame with a filled in black circle is a keyframe.
3: What are 2 of the main reasons people use flash?
a: Vector-based images do not get damaged in flash when magnified or reduced. They do not have pixels that show up when zoomed in.
b: File sizes can be optimized due to the low file size of vector graphics, speeding up the process of rendering. Flash can also import from a wide range of media sources.
4: You can only motion tween a _________?
Symbol
5: How can you tell if an object is a shape or a symbol?
A shape, when clicked has a dotted overlay over it. A symbol, when clicked, has a blue outline over it, and its registration point in the upper left corner (unless otherwise denoted by the user.)
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