Answer
Amazon API Gateway is a fully managed service that lets you create, publish, secure, and monitor REST, HTTP, and WebSocket APIs at any scale, acting as the front door for applications to access backend services such as AWS Lambda, EC2, or any other web application, without you needing to manage any servers yourself.
aws apigateway create-rest-api --name 'MyDemoAPI'Real-world example An online store exposes its product catalog and checkout functionality through API Gateway endpoints, which route incoming requests to Lambda functions that handle the actual business logic.