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A fully managed service to create, publish, and secure REST, HTTP, and WebSocket APIs at scale — often the front door to Lambda.
A fully managed message queue that decouples components. Standard (at-least-once, best-effort order) and FIFO (exactly-once, ordered) queue types.
A managed pub/sub service: publish one message to a topic and fan it out to many subscribers (SQS, Lambda, email, HTTP).
Publish an event to an SNS topic subscribed by multiple SQS queues so several consumers each get a copy to process independently.
Standard = high throughput, at-least-once delivery, best-effort ordering. FIFO = strict ordering and exactly-once processing at lower throughput.
Placing a queue between producer and consumer lets each scale and fail independently, absorbing spikes and improving resilience.
To buffer bursts, decouple services, smooth load, and ensure work is not lost if a consumer is slow or temporarily down.
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