What is serverless computing in AWS?

Serverless doesn't mean 'no servers' — it means AWS manages the servers, scaling, and capacity so you focus only on code and config.

• Lambda — event-driven functions; scales 0 → millions, pay per ms of execution.

• Fargate — serverless containers for ECS/EKS; no EC2 to manage.

• API Gateway — serverless HTTP/REST/WebSocket front door.

• DynamoDB on-demand — serverless NoSQL; auto-scales read/write.

• Aurora Serverless v2 — autoscales RDS Aurora capacity by ACU.

• S3, SQS, SNS, Step Functions — all fully serverless data and integration services.

Trade-off: serverless eliminates ops but introduces cold starts (mitigated by SnapStart and Provisioned Concurrency), per-request pricing surprises, and vendor lock-in.