title: The @ sign in Laravel web.php route files
body: <p>What exactly the '@' sign stand for in laravel route file web.php<br>
  Ex: Route::get('/', 'HomeController@index');? please don't tell me what this code does I already know that. but the question is why the @ sign??<br>
  The'@' sign is not a method but the index is. so what is name of this @ sign and what exactly it does?  I'm just curious to know why??? the @ sign.</p>