Amazon offers some really great developer services. One of those is AWS Simple Notification Services, also known as SNS. It’s the trumpet of the AWS symphony.
In SNS, you create a “Topic” which you can think of as the subject of the notification. You will publish a message (think “record”) to the topic, and AWS sends the notification to the subscribers automatically.
Let’s take an example. You’re a zombie, and you’re shuffling around an abandoned farm. Or so you think. You hear a gunshot in the distance, and a gunshot means survivors, and … brainz! Since you’re a good zombie and have been taught to share, you get on your fancy $1000+ iPhone X and send a message to your zombie horde letting them know there are survivors near your location. This could be done with SNS!
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