what is controller and how to get resources in controller code example

Example 1: laravel route controller

use App\Http\Controllers\UserController;

Route::get('user/{id}', [UserController::class, 'show']);

Example 2: route resource laravel

Verb          Path                        Action  Route Name
GET           /users                      index   users.index
GET           /users/create               create  users.create
POST          /users                      store   users.store
GET           /users/{user}               show    users.show
GET           /users/{user}/edit          edit    users.edit
PUT|PATCH     /users/{user}               update  users.update
DELETE        /users/{user}               destroy users.destroy