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It Jetstream from the new Livewire package that replaces Laravel Auth packages:
From the webpage: Laravel Jetstream is a beautifully designed application scaffolding for Laravel. Jetstream provides the perfect starting point for your next Laravel application and includes login, registration, email verification, two-factor authentication, session management, API support via Laravel Sanctum, and optional team management.
If you need to change the icon you must publish the Jetstream views with this command:
php artisan vendor:publish --tag=jetstream-views
Next, you should customize the SVGs located in the
resources/views/vendor/jetstream/components/application-logo.blade.php,
resources/views/vendor/jetstream/components/authentication-card-logo.blade.php,
and
resources/views/vendor/jetstream/components/application-mark.blade.php
components.
Source: Jetstream Documentation
If you want to learn what is Livewire you can read the docs in https://laravel-livewire.com