Amazon API Gateway is a fully managed service that makes API creation, publishing, maintenance, monitoring, and security easy at any scale. APIs are the "front door" to allow applications to access data, business logic, and functionality from your backend service. API Gateway allows you to create RESTful APIs or WebSocket APIs which enable real-time, two-way communication. API Gateway supports both containerized and serverless workloads as well as web applications. API Gateway handles all tasks associated with accepting and processing hundreds of thousands of concurrent API calls. This includes traffic management, CORS support authorization and access control, traffic management, authorization and throttling as well as monitoring and API version management. API Gateway does not have minimum fees nor startup costs. API Gateway has tiered pricing that allows you to reduce your costs as your API usage grows.