Anonymous function & closure

/*Anonymous function with parameter, executed immediately*/
(function(foo, bar){
alert(foo*bar);
})(2,3);

Interestingly anonymous functions used to create closures. Closure is protected variable space.

Consider the following function
(function(){
var foo=2;
var bar=3;
mul = function(){
alert(foo*bar);
}
})();

You won’t get any alerts after its execution. but
mul();

will give an alert !

After anonymous function’s execution, how can function mul get executed? that too accessing its foo and bar?

Will update the post soon!!!