In Laravel, the default route files where you define routes for your application are located in the routes directory. Here are the main default route files in a typical Laravel application:

web.php: This file contains routes that are typically accessed through web browsers. Routes defined in this file are grouped within the web middleware group, which provides features like session state and CSRF protection. This file is ideal for defining routes related to web pages, form submissions, etc.

Route::get('/', function () {
    return view('welcome');
});

api.php: This file contains routes that are meant to be stateless and are usually accessed by APIs. Routes defined here are automatically prefixed with /api and are grouped within the api middleware group, which provides features like rate limiting. This file is suitable for defining routes related to RESTful APIs.

Route::middleware('auth:api')->get('/user', function (Request $request) {
    return $request->user();
});

console.php: This file is used to define routes for Artisan commands. These routes are used to register custom Artisan commands that can be executed via the Laravel command line interface.

Artisan::command('inspire', function () {
    $this->comment('This is an inspiring command!');
})->describe('Display an inspiring quote');

channels.php: This file is used to register event broadcasting channels. It defines authorization callbacks for channels that are used to determine if a user can listen to the channel's broadcasts.

Broadcast::channel('orders.{orderId}', function ($user, $orderId) {
    return $user->id === Order::findOrNew($orderId)->user_id;
});

These route files are automatically loaded by Laravel as part of its routing system. You can define your application's routes in these files based on the type and purpose of the routes (web routes, API routes, console commands, etc.). Additionally, you can create custom route files and load them in the RouteServiceProvider if you need to organize your routes further.