Global vs. Local Variables

• Scope: where can the variable be used?
• Global Variables can be used anywhere in the html document.
• Local Variables can only be used in the function in which they were declared.
• This might be confusing now, but I guarantee this will be the cause of a bug in software you write at some point...
• Example:  Global vs. Local
• Lesson: use var for clarity.  Comment, comment, comment!