Global Values of Symbols
The collection of active global variables and their values represents a mapping between a set of symbols and their various bindings.
In simple programs, we can usually ignore the fact that there are different packages.
Welcome to DrScheme, version 201
> (define x 5) ; What’s going on here?
X is a symbol which is registered (“interned”) in the Scheme session. Its global value has been set to 5. Its global binding has indefinite extent. It has global scope.