This is official Amazon Web Services (AWS) documentation for Amazon API Gateway. This documentation is offered for free here as a Kindle book, or you can read it online or in PDF format. Amazon API Gateway is a fully managed service that makes it easy for developers to publish, maintain, monitor, and secure APIs at any scale. Create an API to access data, business logic, or functionality from your back-end services, such as applications running on Amazon Elastic Compute Cloud (Amazon EC2), code running on AWS Lambda, or any web application. The Developer Guide provides a conceptual overview of Amazon API Gateway and includes detailed instructions for using the service.