laravel 5.3 new Auth::routes()

Recently I start to use laravel 5.3 to write a blog, but I have a question after run php artisan make:auth

when I run this, it will generate routes in my web.php

this is the code in it:

Auth::routes();

Route::get('/home', 'HomeController@index');

Then I run php artisan route:list, I find lots of actions, like LoginController@login...

But I didn't find these actions in my App\Http\Controllers\Auth, where are these?

And also what is the Auth::routes() stand for, I can't find the routes about Auth.

I need someone help, thank you to answer my question

via Chebli Mohamed