What is an SQS dead-letter queue (DLQ)?

SQS is an AWS component, that offers a fully managed distributed queue service. Queues help handle communication between different services or other components in distributed systems.

A DLQ is a special queue for messages which other queues (source queues) can target for messages that can't be processed (consumed) successfully. Dead-letter queues are useful for debugging your application or messaging system because they let you isolate problematic messages to determine why their processing doesn't succeed.

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