what is as in laravel route code example

Example 1: laravel get route

Route::get('/user', 'UserController@index');

Example 2: route() and with() in laravel

Route::get('user/{id}/profile', function ($id) {
    //
})->name('profile');

$url = route('profile', ['id' => 1, 'photos' => 'yes']);

// /user/1/profile?photos=yes

Example 3: routing in laravel

Route::view('/welcome', 'welcome');
Route::view('/welcome', 'welcome', ['name' => 'Taylor']);