jQuery newbie: what does jQuery(function($) { … }) means?

Question

I know in jQuery, $(callback) is the same as jQuery(callback) which has the same effect as $(document).ready().

How about

Answer 1

First off, jQuery() is not the same as $(document).ready()

$() is a shortcut for jQuery()

and...

$(function(){ ...}); is a shortcut for $(document).ready(function(){ ... });

Thus:

jQuery(function(){ ... }) 

Will function the same as

$(document).ready(function({ ... });

But...

jQuery('#foo').css("background-color", "#f00");

would not function the same as

$(document).ready('#foo').css("background-color", "#f00");

So...

jQuery() is not the same as $(document).ready()