Amazon API Gateway
Amazon API Gateway is a fully managed service that makes it easy for developers to create, publish, maintain, monitor, and secure APIs at any scale. It acts as a front door for applications to access data, business logic, or functionality from backend services, such as AWS Lambda functions, EC2 instances, or any HTTP endpoint. It handles all the tasks involved in accepting and processing up to hundreds of thousands of concurrent API calls, including traffic management, authorization, access control, monitoring, and API version management.
Developers should use Amazon API Gateway when building serverless applications, microservices architectures, or RESTful APIs that require scalability, security, and integration with other AWS services. It is particularly valuable for scenarios like mobile backends, web applications, and IoT systems where you need to manage API traffic, implement authentication (e.g., with AWS Cognito), and reduce operational overhead by offloading API management tasks to AWS. It also enables features like caching, request/response transformation, and API monetization.