What is connection in laravel 5.1 php artisan queue:listen connection?

This is what is said in the document, I don’t quite understand it

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This is what is said in the document, I don’t quite understand it

php artisan help queue:listen

<code>Arguments:
  connection               The name of connection</code>

is actually the name of the queue
. Where is it configured?
configqueue.php lists some queues sync, beanstalkd, redis name

Replace connection with these names. It doesn’t matter if you don’t replace it. The configuration file has set default