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API Gateway
Amazon API Gateway is a managed service for creating, publishing, securing, and monitoring APIs.
What it does
Managed API front door for backend services.
When to use
Use API Gateway when you need a managed public entry point for REST, HTTP, or WebSocket APIs.
Key Concepts
API Gateway can front Lambda, HTTP backends, and other integrations.
It supports authentication, throttling, and stages.
Often used in serverless architectures.
Logging and metrics integrate with CloudWatch.
Common Use Cases
Building serverless APIs.
Exposing internal services through managed endpoints.
Adding auth and throttling to APIs.
Interview Questions
What is API Gateway?
How does API Gateway work with Lambda?
Why use API Gateway instead of exposing backend directly?