• The scope is SET of objects, variables and function and the JavaScript can have GLOBAL scope variable and local scope variable.
• The global scope is a window object and its used out of function and within the functions.
• The local scope is a function object and its used within the functions.

The EXAMPLE for global scope variable

var gblVar = "Anil Singh";
function getDetail() {

console.log(gblVar);
}

and other example for global
function demoTest() {
x = 15;
};
console.log(x); //out PUT is 15

The example for local scope variable
function getDetail() {

var gblVar = "Anil Singh";
console.log(gblVar);
}

and other example for local
function demoText() {
var x = 15;
};
console.log(x); //undefined

The example for global scope variable

var gblVar = "Anil Singh";
function getDetail() {

console.log(gblVar);
}

and other example for global
function demoTest() {
x = 15;
};
console.log(x); //out put is 15

The example for local scope variable
function getDetail() {

var gblVar = "Anil Singh";
console.log(gblVar);
}

and other example for local
function demoText() {
var x = 15;
};
console.log(x); //undefined