AWS SNS: How to Send Notifications in AWS | AWS SNS Basics: How to Publish & Subscribe to Messages

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What is AWS Simple Notification Service (SNS)?

If you've ever received an automated text or email from a service, you've likely interacted with something like AWS SNS. It is a fully managed messaging service that allows you to send notifications to a large number of subscribers simultaneously.

Key Concepts of SNS

To understand how SNS works, you need to know four simple terms:

• Topic: Think of this as a "broadcasting station" or a group. It's the channel where you send your messages.
• Publisher: The application or service that sends (publishes) the message to the topic.
• Subscriber: The people or systems that "listen" to the topic and receive the message.
• Message: The actual content—like a text alert, an email, or a piece of data (JSON).

Who Can Receive SNS Messages?

SNS is incredibly flexible. You can send messages to:

• Humans: Via SMS (Text), Email, or Mobile Push Notifications.
• Systems: Via AWS Lambda, SQS queues, or HTTP endpoints.

Step-by-Step: How It Works

1. Create a Topic: Give your notification group a name (e.g., "OrderUpdates").
2. Add Subscribers: Add the email addresses or phone numbers of the people who should get the alerts.
3. Publish a Message: When an event happens, send a message to the topic.
4. Fan Out: SNS automatically "fans out" that one message to every single subscriber in the list!

Why Use AWS SNS?

It is designed for Scalability (can handle millions of users), Reliability (highly available), and is Cost-Effective because you only pay for what you use.

Free Resources:

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