What is the difference between window and document?

Below are the main differences between window and document,
Window
It is the root level element in any web page
By default window object is available implicitly in the page
It has methods like alert(), confirm() and properties like document, location
Document
It is the direct child of the window object. This is also known as Document Object Model(DOM)
You can access it via window.document or document.
It provides methods like getElementById, getElementByTagName, createElement etc