jQuery question: what does it really mean?

Question

(function($, window, undefined){
  ... jquery code... 
})(jQuery, window);

What does it really mean? Does it also mean $(document).ready()

Answer 1

@rsp has a great answer for this specific question.

For general background on this pattern also see http://www.adequatelygood.com/2010/3/JavaScript-Module-Pattern-In-Depth.