JQuery (function ($) {...}) Detailed description of (jQuery)

jquery (function ($) {...}) Detailed description of (jquery)

Function (ARG) {...}
This defines an anonymous function with the argument arg

When you call a function, you write parentheses and arguments behind the function, and because of the precedence of the operator, the function itself

Parentheses are required, namely:
(function (ARG) {...}) (param)
This is equivalent to defining an anonymous function with arg parameter, and Param as an argument to call this anonymous

Function

(function ($) {...}) (jquery) is the same, only used in formal parameters to use $, is to not with other

Library conflicts, so the argument is in jquery
var fn = function ($) {...};
fn (jquery);