سلام
Laravel's queue configuration options are stored in your application's config/queue.php
configuration file. In this file, you will find connection configurations for each of the queue drivers that are included with the framework, including the database, Amazon SQS, Redis, and Beanstalkd drivers,
میشه قسمت بالا کمی بیشتر توضیح بدید. این connectionها queue driver رو پیکربندی میکنن تا مثلا به database متصل بشه؟ و منظور از backend queue servicesها چی هست؟