A SYMBOL is "a way of saving an element" in Flash that allows you to reuse that element without increasing the File size of your project.
Symbols live in the LIBRARY (Apple_L/Contol_L) (Think of them as the "original" element stored in a safe place in your project)
You can drag "copies" or "clones" of that original to the Stage, where they can get scaled, skewed, rotated, flipped Horizontally or Vertically, even Tinted, but they always keep the relation or dependency to the "original one" living in the Library.
If you alter the "original" element in the Library, all copies or INSTANCES, down on the Stage of your project will get modified accordingly.
"Green circle" is a library element.
In the LIBRARY we see that greencircle is a GRAPHIC SYMBOL .
Greencircle is selected on stage (that's why we see a blue square around it).
The Properties window displays information about the selected item, and we can see that the item on Stage is described as an INSTANCE of the graphic symbol "green circle".
Instances of Symbols placed on Stage can change their appearance by Modifying their color attributes in the Properties window. It works by percentage (modify it a 20%, 40% or 100%) and if you apply a Motion Tween between 2 keyframes containing different values for that same instance, you will get a smooth transition for the effect.
You can alter the Brightness of an instance (all the way up to White, all the way down to black)
You can Tint an instance with any color of your palette (you can also write down the RGB value of the Tint-color)
You can modify the Alpha or Transparency, what will make your instance transparent to whatever you have in a layer below (depending on percentage). A Motion Tween of a symbol that has been set to ALPHA=0 in one of the keyframes, will cause an effect of appearing or disapearing on Stage.
You can use the Advanced method when you want to alter the Color and the Alpha at the same time in a keyframe.
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