AWS SNS vs. SQS

A publish-subscribe messaging service
One-to-many communication model
Messages can be sent to multiple recipients
Supports multiple protocols such as HTTP, HTTPS, email, and SMS
Ideal for fan-out scenarios and event-driven architectures
Can be used for sending push notifications to mobile devices
Supports message filtering based on attributes
Provides a flexible delivery mechanism with retries and error handling
Offers a scalable solution for distributing messages to a large number of subscribers
Easy to set up and manage through the AWS Management Console

A message queue service
Many-to-many communication model
Supports both standard and FIFO (First-In-First-Out) queues
Provides a reliable way to exchange messages between applications
Ideal for background processing, parallel processing, and decoupled systems.
Offers a highly available and scalable solution for exchanging messages between applications
Supports batch processing of multiple messages with a single request
Allows messages to be delivered in a guaranteed order with FIFO queues
Offers automatic and manual message deletion to control message lifecycle
Supports message visibility timeout to ensure that messages are processed in a timely manner.