Amazon Simple Queue Service
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Amazon Simple Queue Service (Amazon SQS) is a messaging service provided by Amazon.com. It supports programmatic sending of messages by computer programs as a way to communicate over the web. In some sense it could be compared with an instant messaging service for software.
Amazon SQS can be described as commoditization of the messaging service provided by Java Message Service and Microsoft Message Queuing technologies. Whereas with Java Message Service, let's say, the users would have to maintain their own server, Amazon SQS does it for them and sells the service at per-use rate.
Expected message latency, as of 2007, was 2-10 seconds.
Price, as of 2007, was $0.3 per 1000 messages sent.