Amazon Web Services Simple Notification Service (AWS SNS) is an automated web service that delivers the functionality of sending notifications to the subscribers that are mapped to it. SNS offers this service to application-to-person and application-to-application. It employs the publishers/subscribers paradigm for message push and delivery. The loss of data is avoided by storing the data in more than one availability zone. It is cost-effective and offers low-cost infrastructure, particularly for mobile users. It delivers the notifications in the form of SMS or email to an Amazon Simple Queue Service (SQS), AWS lambda functions, or an HTTP endpoint. When the CPU usage of an instance exceeds 80%, the AWS cloudwatch alarm is activated. The cloudwatch alarm triggers the SNS topic thus informing the subscribers of the instance high CPU usage. SNS service has a topic which has a distinct name. It is a logical access point and a communication channel for publishers and subscribers.

Imagine you run a jam-packed city post office—but in the digital world. That’s Amazon SNS (Simple Notification Service) in action.

In 2010, AWS introduced SNS to take care of the “heavy-lifting” behind messaging—no more building, maintaining, or scaling complex delivery systems yourself.

1.You publish a message. Think along the lines of, “Hey, user 123 just booked a ticket!”

2.SNS acts like the post office. It grabs that message, looks at the address list (your “topic” subscribers), and pushes it out instantly.

3.Subscribers receive it. These could be

• An email to the user
• A server endpoint that logs the booking
• A Lambda function that adds reward point.
• An archive system that saves it for future audits And voilà — everyone gets the memo, automatically.
• Use cases Of (AWS) Amazon Simple Notification Services (SNS)
• Decoupling microservices and distributed systems: SNS is primarily to decouple microservices and distributed systems by offering that will enable them to talk to one another asynchronously. Facilitates enhancing the scalability and reliability of the systems.
• Posting notifications to users: You can use SNS to post notifications to users regarding events in your applications. For instance, you can use SNS to post a notification to users when they get a new message, when their account is modified, or when an event happens that they are subscribed to.
• Alerting operators: SNS can be utilized to alert operators on issues that arise in your applications. For instance, you can employ SNS to alert operators when a server fails or when there is an error.
• Constructing serverless applications: SNS can be employed to construct serverless applications by offering a mechanism for them to interact with one another and to send and receive notifications.