Which service is designed to publish, monitor, and secure APIs exposed to applications?

• A. Amazon Pinpoint
• B. Amazon API Gateway
• C. AWS Amplify
• D. AWS IoT Analytics

Answer: (B)

APIs published for applications need a centralized gateway that handles exposure, access control, traffic management, and observability. Amazon API Gateway fits this role perfectly: it lets you publish RESTful or WebSocket APIs, connect to backend services such as Lambda, EC2, or HTTP endpoints, and enforce security with IAM, Cognito, or custom authorizers. It also manages traffic with throttling and quotas, supports API keys and usage plans, and provides integrated monitoring and logging through CloudWatch, plus security options like AWS WAF. The other services target different tasks—Pinpoint for mobile messaging and analytics, Amplify for frontend app development and hosting, and IoT Analytics for processing IoT data—so they don’t fulfill the API gateway function.