From RabbitMQ

This task lets you receive a message from your RabbitMQ queue.

Receive messages while
The duration (in seconds) for which the call waits for a message to arrive in the queue before returning.

Amount
Retrieves one or more messages from the specified queue.

Force reconnect
Force reconnection for each iteration.

Sleep
Amount of second during which the task will be suspended after each iteration.

Connection
Choose between "By object" or "by fields" method and then type the Queue Name.

A queue is the name for a post box which lives inside RabbitMQ. Although messages flow through RabbitMQ and your applications, they can only be stored inside a queue. A queue is only bound by the host's memory & disk limits.