What are the differences between Pub/Sub and SQS?

What are the differences between Pub/Sub and SQS?

Pub/Sub and SQS are both messaging services, but they have different architectures and use cases. Pub/Sub is designed for real-time messaging and supports many-to-many communication, while SQS is a queue-based service that supports point-to-point messaging.

Can you explain how Pub/Sub handles message delivery?

Sure! Pub/Sub uses a publish-subscribe model where messages are sent to a topic and delivered to all subscribers. It ensures at-least-once delivery, meaning subscribers may receive the same message multiple times.

What about SQS? How does it ensure message delivery?

SQS guarantees at-least-once delivery as well, but it uses a queue system. Messages are stored in a queue until they are processed by consumers, which can lead to messages being delivered more than once if not handled properly.

Which one should I use for my application?

It depends on your use case. If you need real-time updates and many-to-many communication, go for Pub/Sub. If you need a reliable queue for processing tasks, SQS is a better choice.