The CreateQueue action creates a new queue, or returns the URL of an existing one. When you request CreateQueue, you provide a name for the queue. To successfully create a new queue, you must provide a name that is unique within the scope of your own queues. If you provide the name of an existing queue, a new queue isn't created and an error isn't returned. Instead, the request succeeds and the queue URL for the existing queue is returned. A CreateQueue call may include attributes to set on a newly created queue. The effect is the same as the CreateQueue call followed by a SetQueueAttributes call (with the same attributes). However, when the queue already exists CreateQueue will not update any attributes. It simply compares the attribute values provided with the current settings on the existing queue, and returns the queue URL if the values match. Otherwise, it responds with an error otherwise. SetQueueAttributes should be used to change the values of attributes for an existing queue. The GetQueueUrl action takes the name of a queue and returns its URL. The ListQueues action returns a list of your queues. Adds the specified permission(s) to a queue for the specified principal(s). This allows for sharing access to the queue. The ChangeMessageVisibility action resets the visibility timeout for the specified receipt handle to the specified value. The message identified by ReceiptHandle should become visible approximately VisibilityTimeout seconds after successful completion of this action, unless DeleteMessage or ChangeMessageVisibility is called first. The DeleteMessage action unconditionally removes the specified message from the specified queue. Even if the message is locked by another reader due to the visibility timeout setting, it is still deleted from the queue. This action unconditionally deletes the queue specified by the queue URL. Use this operation WITH CARE! The queue is deleted even if it is NOT empty. Gets one or all attributes of a queue. Available attributes are [ApproximateNumberOfMessages, ApproximateNumberOfMessagesNotVisible, VisibilityTimeout, CreatedTimestamp, LastModifiedTimestamp, Policy, MaximumMessageSize, MessageRetentionPeriod, QueueArn]. Removes the permission with the specified statement id from the queue. Retrieves one or more messages from the specified queue, including the message body and message ID of each message. Messages returned by this action stay in the queue until you delete them. However, once a message is returned to a ReceiveMessage request, it is not returned on subsequent ReceiveMessage requests for the duration of the VisibilityTimeout. If you do not specify a VisibilityTimeout in the request, the overall visibility timeout for the queue is used for the returned messages. Possible attributes that can be requested with messages include [SenderId, ApproximateFirstReceiveTimestamp, ApproximateReceiveCount, SentTimestamp]. The SendMessage action adds a message to the specified queue. If DelaySeconds is specified, the message won't be delivered until the specified number of seconds has elapsed. Otherwise, the message may be delivered immediately. Sets the value of one or more queue attributes. Valid attributes that can be set are [VisibilityTimeout, Policy, MaximumMessageSize, MessageRetentionPeriod]. A batch version of ChangeMessageVisibility. Each batch request contains one or more entries. Each entry is identified by its Id (referred to as entry id) and represents a receipt handle for which the visibility timeout has to be changed. For each entry in the batch, the response will contain one of ChangeMessageVisibilityBatchResultEntry (success) or BatchResultErrorEntry (failed) signifying the result. The batch version of DeleteMessage. Each batch request contains one or more entries. Each entry is identified by its Id (referred to as entry id) and represents the receipt handle for a message that has to be deleted. For each entry in the batch, the response will contain one of DeleteMessageBatchResultEntry (success) or BatchResultErrorEntry (failed) signifying the result. A batch version of SendMessage. Each batch request has one or more entries in it. Each entry is identified by its Id (referred to as entry id) and represents a message to be enqueued. If DelaySeconds is not specified for an entry, the default for the queue is used. For each entry in the batch, the response will contain one of SendMessageBatchResultEntry (success) or BatchResultErrorEntry (failed) signifying the result. Amazon Simple Queue Service (Amazon SQS) offers a reliable, highly scalable hosted queue for storing messages as they travel between computers. By using Amazon SQS, developers can simply move data between distributed application components performing different tasks, without losing messages or requiring each component to be always available. Amazon SQS works by exposing Amazon's web-scale messaging infrastructure as a web service. Any computer on the Internet can add or read messages without any installed software or special firewall configurations. Components of applications using Amazon SQS can run independently, and do not need to be on the same network, developed with the same technologies, or running at the same time.