What is API Gateway? Every Developer Must Know | Rate Limiting & Circuit Breaker Explained in Hindi

Description

You have 15 microservices. Users, Payments, Orders, Notifications, Products — all running independently. Now your mobile app needs to talk to all of them. Should it know every URL? Handle authentication for each one? Make 10 separate API calls just to load one screen? That's the exact problem API Gateway was built to solve. And in this video we break it down completely — from the core concept to Netflix's real implementation to the exact interview answer. What we cover: 🔷 What API Gateway is and why it exists as a single entry point for all client requests 🔷 The chaos that happens in microservices architecture without a Gateway — multiple URLs, repeated auth, messy updates 🔷 Routing — how the Gateway maps incoming requests to the right microservice 🔷 Authentication — how token validation happens centrally so microservices don't have to do it themselves 🔷 Rate Limiting — how Gateway controls requests per user and provides DDoS protection 🔷 Request Aggregation — how one client request can internally trigger multiple microservice calls and return a single combined response 🔷 Circuit Breaker — how Gateway prevents a failing service from taking down the entire application 🔷 How Netflix uses Zuul Gateway to manage 500+ microservices across TV, mobile, and laptop clients 🔷 API Gateway vs Load Balancer — the most commonly confused system design concepts and why they are fundamentally different 🔷 The exact one-line interview answer that covers everything Exact Interview Answer: "API Gateway is a single entry point for all client requests in a microservices architecture. It handles routing, authentication, rate limiting, caching, request aggregation, circuit breaking, and monitoring centrally — so individual microservices only need to focus on business logic. Every API Gateway acts as a reverse proxy, but a reverse proxy is not necessarily an API Gateway. Real-world examples include Netflix's Zuul, AWS API Gateway, and Kong." 💬 Comment "DOC" for the complete System Design Foundation notes sent straight to your DMs. 💾 Save this. API Gateway comes up in almost every microservices and system design interview. 🔔 Subscribe @saty for the complete System Design Foundation Series every week. Radhe Radhe 🙏