AWS Lambda is a serverless compute service that lets you run code without provisioning or managing servers. With Lambda, you can run code for virtually any type of application or backend service — just set up your code to automatically trigger from other AWS services or call it directly from any web or mobile app.
Amazon API Gateway is a fully managed service that allows you to create, publish, maintain, monitor, and secure APIs at any scale. With API Gateway you can create an API that acts as a “front door” for AWS Lambda functions. https://goo.gl/6CJnKr
