When a consumer receives and processes a

message from a queue, the message remains in

the queue.

▪ the consumer must delete the message from the

queue after receiving and processing it.

▪ Visibility timeout; a period of time during which

Amazon SQS prevents other consumers from

receiving and processing the message.

▪ The default visibility timeout for a message is 30

seconds.

▪ Configuring visibility timeout for a queue using

the console

https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-visibility-timeout.html