Find out the difference between global and local variables. Global variables are declared outside any function, and they can be accessed (used) on any function in the program. Local variables are declared inside a function, and can be used only inside that function. It is possible to have local variables with the same name in different functions. Even the name is the same, they are not the same. It's like two people with the same name. Even the name is the same, the persons are not.
The scope of a variable refers to where is a variable visible or accesible. If a person asks what is the scope of a variable, she's asking whether it is local or global.