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Serverless Architecture — No Servers to Manage

Serverless doesn't mean no servers — it means you don't manage them. AWS handles provisioning, patching, and scaling.


Core serverless services:

AWS Lambda — run functions on demand; event-triggered; auto-scales to zero

Amazon API Gateway — create, publish, maintain REST and WebSocket APIs; integrates with Lambda

Amazon DynamoDB — serverless NoSQL database; auto-scales

Amazon S3 — serverless object storage

AWS Fargate — serverless containers

Amazon Aurora Serverless — on-demand, auto-scaling relational database


A typical serverless architecture:

User → API Gateway → Lambda → DynamoDB

S3 → Lambda → Processing → SQS → Lambda


Benefits of serverless:

No server management

Automatic scaling from 0 to millions of requests

Pay only for actual usage (down to milliseconds)

High availability by default


Limitations: Cold starts (first invocation can be slow), 15-minute execution limit for Lambda, vendor lock-in, debugging complexity.


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Reference:

Wikipedia: Serverless Computing

image for linkhttps://en.wikipedia.org/wiki/Serverless_computing

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