SNS (Simple Notification Service) – AWS’s pub/sub messaging service.
Amazon SNS is a fully managed pub/sub messaging service for both application-to-application and application-to-person communication. It supports multiple protocols (HTTP/S, email, SMS, mobile push) and features message filtering, message attributes, and delivery retry policies. SNS includes FIFO topics for ordered message delivery, message archiving to S3, and integration with Lambda for event processing. The service provides message encryption, access policies, and detailed delivery status tracking.
