What is an API? (The Only Explanation You'll Need)

Your boss wants a mobile app, but all the logic lives glued inside the website. Duplicate everything? That's a maintenance nightmare that only gets worse. Split it into an API and both the website and the app become clients of the same backend. I walk through why, then build the API endpoint live. APIs explained from concept to working endpoint. Restaurant analogy first (menu = interface, waiter = access control, kitchen = backend, abstraction = you don't care if they switch stoves), then the three main types of web APIs (REST for request/response, WebSocket for real-time, GraphQL for flexible queries), then a real business case: your website logic is glued into a monolith, the boss wants a mobile app, and duplicating everything is a path to maintenance pain. The answer is splitting the logic into an API that both clients share. Agent Toolkit for AWS: https://go.aws/4h3bBMw Read the blog: https://go.aws/4hzoBJV Follow AWS Developers! 🆇 X: https://go.aws/3T61zBb 💼 LinkedIn: https://go.aws/4ADSDEb 0:00 APIs Are Everywhere 0:52 The Restaurant Analogy (Menu, Waiter, Kitchen) 1:58 Types: REST, WebSocket, GraphQL 2:58 Real Case: Your Boss Needs a Mobile App 4:16 One API, Multiple Clients 5:26 Building an API with Kiro + Agent Toolkit 8:06 One Prompt: API Gateway + Lambda Deployed 9:36 Recap #AWS #API #Lambda