Generally, the use of _global is recommended.
_root
When you load a MovieClip into the root of your movie, all previous _root variables are lost;
_root variables can be called and set by using the _root. prefix;
_global
Aren't lost when you load a new MovieClip;
Applies to all movies within the player;
Can be called from anywhere by either using or not using the _global. prefix;
Local variables (local means on the timeline you are working on) with the same name as a global variable, have priority.
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