javascript - Meaning of (function($) { })(jQuery) (e.g., in jQuery Enlightenment book) -

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I love the "Dome Enlightenment" book and read companion volume for it.

I have used basic jquery, like below and I understand them .. 

  $ (document) .bind (â ???? contextmenuâ? ???, function () {// do something}};   
 But the book mentions something like below ... and I do not understand how it is used?  
  (function ($) {// $ chaos use worry-free alerts ('you're using jQuery' $ (.) .jquery);}) (jQuery) < / code>   
 
 
  (function () {// $ alias worry-free conflict alerts ('you are using jQuery' $$) .jquery);}) ()   
 this  
 $ (). Jquery is used to get jquery version being used.  
 This anonymous task is used when it Every time we are unconditionally Want a specific code to run.

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