Amazon Simple Notification Service is
a web service that coordinates and manages the delivery or sending of messages
to subscribing endpoints or clients. In Amazon SNS, there are two types of client’s
publishers and subscribers also referred to as producers and consumers.
Publishers communicate asynchronously with subscribers by producing and sending
a message to a topic, which is a logical access point and communication
channel. Subscribers (i.e., web servers, email addresses, Amazon SQS queues)
consume or receive the message or notification over one of the supported
protocols when they are subscribed to the topic. When using Amazon SNS,
you as the owner create a topic and control access to it by defining policies
that determine which publishers and subscribers can communicate with the topic.
A publisher sends messages to topics that they have created or to topics they
have permission to publish to. Instead of including a specific destination
address in each message, a publisher sends a message to the topic. Amazon SNS
matches the topic to a list of subscribers who have subscribed to that topic,
and delivers the message to each of those subscribers. Each topic has a unique
name that identifies the Amazon SNS endpoint for publishers to post messages
and subscribers to register for notifications. Subscribers receive all messages
published to the topics to which they subscribe, and all subscribers to a topic
receive the same messages.
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