REST vs GraphQL vs gRPC Explained | When to Use What

In this video, we don’t just compare technologies… We understand WHY they exist, WHAT problems they solve, and WHEN they fail — exactly how real engineers think. 📌 What You’ll Learn ✅ Why REST was created (and its limitations) ✅ Over-fetching & under-fetching explained ✅ Why GraphQL was introduced ✅ GraphQL advantages + real-world problems ✅ Why gRPC exists (high-performance communication) ✅ Complete production comparison (REST vs GraphQL vs gRPC) ✅ Real-world architecture (Frontend + Microservices) ✅ Live demo (FastAPI + GraphQL example) 🧠 Core Concept (Simple Analogy) 🍽️ REST → Full Thali (extra data bhi milega) 🍽️ GraphQL → Only what you order 📞 gRPC → Fast direct communication (optimized for machines) ⚡ When to Use What? 👉 REST Public APIs Simple applications Easy debugging 👉 GraphQL Frontend-heavy apps Mobile apps (limited bandwidth) Flexible data requirements 👉 gRPC Microservices communication High-performance systems Low latency internal APIs 🏗️ Real Production Architecture Frontend (React) ↓ GraphQL Gateway ↓ Microservices (User, Orders, Payments) ↓ gRPC Communication 💡 Key Learning 👉 No technology is “best” ✅ REST = simple & reliable ✅ GraphQL = flexible & precise ✅ gRPC = fast & efficient 🔥 The real question is: “Which problem are you trying to solve?” 🎯 Who Should Watch? System Design learners Backend developers Interview preparation Anyone confused between REST / GraphQL / gRPC ❤️ If you found this helpful: 👍 Like the video 🔁 Share with friends 💬 Comment what topic you want next #SystemDesign #RESTAPI #GraphQL #gRPC #BackendEngineering #DistributedSystems #TechInterview #SoftwareEngineering #APIDesign GitHub Repository Link: https://github.com/Vaibhav-Joshi-code...