Chapter 9, Asynchronous Task Execution on AWS Lambda

1. AWS SNS is a web service provides a messaging implementation as a publish and subscribe pattern. It supports various resources to subscribe over a channel and get published messages. It can be used to manage and implement a notification service for your application. There are many other features, which can be considered to AWS SNS service for your application development.
2. AWS SNS works on to publish and subscribe pattern. As it supports AWS Lambda to be registered as a subscriber. It can invoke the AWS Lambda function with the published message context.