What does the jQuery() function do? -

In answer to the question

I have a follow-up question. What does the jQuery () function do? (There are four answers on this; the subject should describe at least selector and element-set mode)

I tried with googling but could not get a clear answer.

Thanks for any help in advance.

jQuery function input:

• $ ("") , $ (zero) , or $ (undefined) < Li> $ (DOMElement)
• $ (html) -> $ (array)
• $ ("# id")
• $ ("TAG")
• $ (expr, $ (...))
• $ (expr, context)
• $ (function)

To see how this is controlled, see, respectively.