Global Scope

Variables declared using the var keyword always possess Global Scope and cannot have block scope.

Example

Variables declared with var inside a { } block can be accessed from outside that block.

{
var x = 2;
}
// x CAN be used here

Cannot be Redeclared

Variables defined with let can not be redeclared, preventing accidental redeclaration of a variable already declared with let.

You cannot perform this action with let.

let x = “John Doe”;

let x = 0;

Variables defined with var can be declared again.

With var, you are able to do this:

var x = “John Doe”;

var x = 0;