Laravel - How Kernel create

In public\index.php, i just dump $kernel variable like

$app = require_once __DIR__.'/../bootstrap/app.php';
$kernel = $app->make(Illuminate\Contracts\Http\Kernel::class);

dd($kernel);die;

Result $kernel is Illuminate\Foundation\Http\Kernel not Illuminate\Contracts\Http\Kernel. How Illuminate\Foundation\Http\Kernel create?

via Chebli Mohamed