sns

# AWS SNS Amazon Simple Notification Service (SNS) is a fully managed pub/sub messaging service for application-to-application (A2A) and application-to-person (A2P) communication. ## Table of Contents - [Core Concepts](#core-concepts) - [Common Patterns](#common-patterns) - [CLI Reference](#cli-reference) - [Best Practices](#best-practices) - [Troubleshooting](#troubleshooting) - [References](#references) ## Core Concepts ### Topics Named channels for publishing messages. Publishers send to topics, subscribers receive from topics. ### Topic Types | Type | Description | Use Case | |------|-------------|----------| | **Standard** | Best-effort ordering, at-least-once | Most use cases | | **FIFO** | Strict ordering, exactly-once | Order-sensitive | ### Subscription Protocols | Protocol | Description | |----------|-------------| | **Lambda** | Invoke Lambda function | | **SQS** | Send to SQS queue | | **HTTP/HTTPS** | POST to endpoint | | **Email** | Send email | | **SMS** | Send text message | | **Application** | Mobile push notification | ### Message Filtering Route messages to specific subscribers based on message attributes. ## Common Patterns ### Create Topic and Subscribe **AWS CLI:** ```bash # Create standard topic aws sns create-topic --name my-topic # Create FIFO topic aws sns create-topic \ --name my-topic.fifo \ --attributes FifoTopic=true # Subscribe Lambda aws sns subscribe \ --topic-arn arn:aws:sns:us-east-1:123456789012:my-topic \ --protoc...