Shortest JS Program🔥, `window` & `this`

The shortest JS program is an empty file. Even though the file is empty and has nothing to do, it still creates a Global Execution Context.
window is a global object that is created along with the JS execution Context.
When GEC is created, the JS engine also creates window, which is created in global space. window is a big object with a lot of functions and methods. We can access all these functions and methods anywhere in our JavaScript program.
The JS engine also creates the this keyword, at the global level, this keyword points to the window object.
In different engines, the name of the global object changes. It is a window in browsers, but in Node.js, it is called something else. At the global level, this === window.
Anything that is not inside a function is in the global space.
If we create any variable in the global scope, the variables get attached to the global object. Example:

var x = 10;
console.log(x); // 10
console.log(this.x); // 10
console.log(window.x); // 10

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