PHP - difference of use keyword outside of class and use keyword inside of a class

Good day guys!

Just want to ask the difference of use outise the class and use inside the class ? I have also googled it, but my question doesnt match an answer.

Example:

namespace App\Http\Controllers\Auth;

use Validator;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\ThrottlesLogins;
use Illuminate\Foundation\Auth\AuthenticatesAndRegistersUsers;
use Auth;
use Illuminate\Http\Request;

class AuthController extends Controller
{

    use AuthenticatesAndRegistersUsers, ThrottlesLogins;

    protected $redirectTo = '/';

    /**
     * Create a new authentication controller instance.
     *
     * @return void
     */
    public function __construct()
    {
       // Some Code
    }

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