1. Standard and FIFO queues.
2. 300 operations per second – up to 3,000 messages with batches of 10.
3. HTTPS.

4. The time the message will be hidden after it was read by a consumer and before it becomes visible in the queue again.
5. ReceiptHandle – the unique identifier for the message that was received; MD5OfBody – the MD5 sum of the body of the message, used for delivery consistency; and MessageId – the identifier of the message in the queue.
6. ReceiptHandle.
7. The messages are corrupt and aren't being processed, thus not being deleted before becoming visible again.
8. There's no way to do this: once purged, messages are gone.