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What are Volatile and Dead letter queues?

Volatile Queues:There are scenarios in the project when you want the message to deliver in proper time. The timely delivery of message is very more important and to ensure they are not lost is important too. Volatile queues are used for such purposes.

Dead-Letter Queues:Queues are needed so that client and server are not required to run at the same time when the message is sent. When a message lies inside a queue for a long time on the server and becomes invalid after some time period, then such messages are not to be sent to the client. All these messages are sent to dead-letter queue. Therefore, dead-letter queues are responsible for storing messages that fail timely delivery.