title: What is Closure in Laravel?
body: <p>I saw one Laravel function in middlewere:</p>
  
  <pre><code>public function handle($request, Closure $next, $guard = null)
  {
      if (Auth::guard($guard)-&gt;check())
      {
         return redirect('/home');
      } 
  
      return $next($request);
  }
  </code></pre>
  
  <p>What is <code>Closure</code> and what does it do?</p>