sns

1# AWS SNS
2 
3Amazon Simple Notification Service (SNS) is a fully managed pub/sub messaging service for application-to-application (A2A) and application-to-person (A2P) communication.
4 
5## Table of Contents
6 
7- [Core Concepts](#core-concepts)
8- [Common Patterns](#common-patterns)
9- [CLI Reference](#cli-reference)
10- [Best Practices](#best-practices)
11- [Troubleshooting](#troubleshooting)
12- [References](#references)
13 
14## Core Concepts
15 
16### Topics
17 
18Named channels for publishing messages. Publishers send to topics, subscribers receive from topics.
19 
20### Topic Types
21 
22| Type | Description | Use Case |
23|------|-------------|----------|
24| **Standard** | Best-effort ordering, at-least-once | Most use cases |
25| **FIFO** | Strict ordering, exactly-once | Order-sensitive |
26 
27### Subscription Protocols
28 
29| Protocol | Description |
30|----------|-------------|
31| **Lambda** | Invoke Lambda function |
32| **SQS** | Send to SQS queue |
33| **HTTP/HTTPS** | POST to endpoint |
34| **Email** | Send email |
35| **SMS** | Send text message |
36| **Application** | Mobile push notification |
37 
38### Message Filtering
39 
40Route messages to specific subscribers based on message attributes.
41 
42## Common Patterns
43 
44### Create Topic and Subscribe
45 
46**AWS CLI:**
47 
48```bash
49# Create standard topic
50aws sns create-topic --name my-topic
51 
52# Create FIFO topic
53aws sns create-topic \
54  --name my-topic.fifo \
55  --attributes FifoTopic=true
56 
57# Subscribe Lambda
58aws sns subscribe \
59  --topic-arn arn:aws:sns:us-east-1:123456789012:my-topic \
60…