Answer 1

A global variable exists everywhere in the program after it is declared.

If you made this function:

def func:
x = 5 # new variable
return x
#function definition ends
print(x)
#this does not work because x only exists inside the function.

That is a not a global variable because it only exists inside the function. A global variable is not declared inside a function and can be used anywhere after it is declared.