When You say Package variable, then you mean global variable.

When you say global, you mean package variable.

Package variables are global. Loosely speaking, people also call file-scoped lexicals global variables, so you can have global lexical variables too.

What if, I declare a package variable and that variable does not exist in the package. Will that variable be created in the package ?

Declaring means to make exist. Your condition is a contradiction (never true).

If a variable is declared without "my" prefix, thats a global variable or package variable, right

How are you declaring it?

use vars qw( $var ); declares a package variable.

our $var; declares a package variable. (Not exactly, but it's a useful simple way of thinking of it.)

If a variable is not declared as global variable (package variable), then can we still use this variable $x as local variable ?

I think you're asking if you can use local can be used on variables other than package variables. Yes.

• Package variables
• Array elements
• Hash elements

Note that it doesn't matter if the package variable was declared or not.