Amazon SNS

Amazon Simple Notification Service (Amazon SNS) is a fully managed Pub/Sub service designed for application-to-application (A2A) and application-to-person (A2P) messaging. It enables the delivery of A2A notifications to integrate and decouple distributed applications, facilitating high-throughput, push-based, many-to-many messaging between distributed systems, microservices, and event-driven serverless applications. These applications include Amazon Simple Queue Service (SQS), Amazon Kinesis Data Firehose, AWS Lambda, and other HTTPS endpoints. A2P functionality allows for sending messages to customers through SMS texts, push notifications, and email.

Key features of Amazon SNS include message filtering, batching, ordering, and deduplication to simplify architecture and reduce costs. It also offers increased message durability with archiving, replay, delivery retries, and dead-letter queues (DLQs). For secure messaging, Amazon SNS supports encryption with AWS Key Management Service (KMS), traffic privacy with AWS PrivateLink, and access control with resource policies and tags.