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Laravel What is the difference between use a file inside a calss and use a file outside a class?

For example, we often see a bunch of use after namespace, these use are outside class,
some use is in class again, what is the difference between the two?

Example: HttpControllersAuthRegisterController.php

<?php

namespace App\Http\Controllers\Auth;


use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Validator;
use Illuminate\Foundation\Auth\RegistersUsers;
use Illuminate\Http\Request;
use Illuminate\Auth\Events\Registered;



class RegisterController extends Controller
{
    use RegistersUsers;
    
   //...

}