How to make a route parameter optional in Laravel?

To make a route parameter optional in Laravel, you can use the ? symbol at the end of the parameter name in the route definition. Here's an example:

Route::get('user/{id?}', function ($id = null) {
    // If the id is not provided, it will be set to null.
    // Your code logic here...
});

In this example, the id parameter is optional. If it is not provided in the URL, it will default to null. This allows you to make certain parts of the route optional, so you can have URLs like "/user" and "/user/1" where the "1" is the optional parameter.