Amazon Simple Notification Service (Amazon SNS)
- Fully-managed service for app-to-app (A2A) and app-to-person (A2P) communication
- A2A - messaging between distributed systems, microservices, and event-driven serverless apps
- A2P - message users at scale through SMS, email, or push notifications
Amazon Simple Queue Service (Amazon SQS)
- Fully managed message queuing service
- Send, store, and receive messages between software components at any volume
- Standard queues: maximum throughput, best-effort ordering, at-least-once delivery
- SQS FIFO queues: guarantee that messages are processed exactly once, in the exact order that they are sent
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