SQS (Simple Queue Service) र SNS (Simple Notification Service) AWS को messaging services हुन् जसले application components बीच decoupled, asynchronous संचार सक्षम गर्छन्। SQS एक message queue हो (one-to-one processing); SNS pub/sub हो (one-to-many broadcast)।
SQS — message queues (decoupling, async processing)
SQS is a managed message QUEUE: producers send messages, consumers process them:
→ producer → [QUEUE] → consumer(s) process messages (at their own pace)
→ DECOUPLES components (producer doesn't wait for/depend on the consumer)
→ BUFFERS load (queue absorbs spikes; consumers process steadily)
→ RELIABLE (messages persist until processed; retries; dead-letter queues for failures)
→ SCALABLE (add more consumers to process faster)
→ Use for: async task processing, decoupling services, smoothing load spikes
