Serverless Overviews from a Solution Architect Perspective

RCU and WCU are decoupled, so you can increase/decrease each value separately.

DynamoDB Streams allows you to capture a time-ordered sequence of item-level modifications in a DynamoDB table. It's integrated with AWS Lambda so that you create triggers that automatically respond to events in real-time.

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An Edge-Optimized API Gateway is best for geographically distributed clients. API requests are routed to the nearest CloudFront Edge Location which improves latency. The API Gateway still lives in one AWS Region.