Difference between $(document.body) and $('body')

Question

I am a jQuery beginner and while going through some code examples I found:

$(document.body) and $(\'body\')

Is there any difference

Answer 1

$(document.body) is using the global reference document to get a reference to the body, whereas $('body') is a selector in which jQuery will get the reference to the element on the document.

No major difference that I can see, not any noticeable performance gain from one to the other.