What is Amazon SNS?
Amazon Simple Notification Service (Amazon SNS) is a managed service that provides message delivery from publishers to subscribers (also known as producers and consumers). Publishers communicate asynchronously with subscribers by sending messages to a topic, which is a logical access point and communication channel. Clients can subscribe to the Amazon SNS topic and receive published messages using a supported endpoint type, such as Amazon Data Firehose, Amazon SQS, Amazon Lambda, HTTP, email, mobile push notifications, and mobile text messages (SMS).