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All good points, I think this is where the "plain english" starts to break down and you _have_ to really come to grips with exactly what the services are doing.

I was trying to write this from the standpoint of describing what the services did to another developer in a really high level way.

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I totally agree with the grandparent comment. We use SNS for a few apps, none of which are mobile apps.

If you want a high level explanation for someone, I'd describe it as Amazon Callbacks. It lets you create callbacks for any action in and across any Amazon web service, where that callback can be in the form of an HTTP post (e.g. back to your web application), email, push notification, etc.

Well you did a fantastic job and I learnt a load. Many thanks.

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