AWS Messaging Compared: When to Use SQS, SNS, EventBridge, or Kinesis

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AWS offers four core messaging services for event-driven architecture — SQS, SNS, EventBridge, and Kinesis — each designed to solve distinct communication challenges in distributed systems. SQS functions as a point-to-point buffer queue suited for decoupling producers and consumers and smoothing bursty traffic loads. SNS enables publish-subscribe fan-out, allowing a single event to be broadcast to multiple independent subscribers such as Lambda functions, queues, or HTTP endpoints. EventBridge is best used for content-based routing, filtering, and integrating third-party SaaS event sources like Stripe or Auth0. Kinesis is the recommended choice for high-throughput, ordered, and replayable data streams processing hundreds of thousands of events per second.

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