Why Netflix uses TCP but PUBG uses UDP? (System Design)
🎁 Download the 2026 Architect’s System Design Checklist (FREE PDF): 👉 https://designwealth.gumroad.com/l/acyrh (Enter '0' in the price box to get it for free!) Why does a 200ms lag kill a PUBG game, but a Netflix movie plays perfectly even with a 5-second delay? The answer isn't "Internet Speed". It is the Network Protocol. In this System Design episode, we break down the engineering difference between Real-time Gaming (UDP) vs Video Streaming (TCP). We explain why "Reliability" is sometimes the enemy of "Speed" and how Packet Loss actually works. We go beyond basic definitions to explain real-world backend engineering concepts like Connection Pooling, Socket Exhaustion, and the difference between HTTP/3 (QUIC) and TCP. 🔥 What you will learn in this video: ✅ The "Gaming Lag" Explained: Why "Packet B" causes you to die behind walls. ✅ TCP vs UDP: The "Courier Service vs FM Radio" Analogy. ✅ Head of Line Blocking: Why one lost packet can freeze a website. ✅ Connection Pooling: Handling 50,000 req/min using the "Taxi Stand" logic. ✅ Socket Exhaustion: A critical production mistake with HttpClient in Java/.NET. ✅ Cost Optimization: How choosing the wrong protocol can double your cloud bill. ⏳ Timestamps: 0:00 - Why you die behind cover (The Hook) 1:00 - What you'll learn (The Menu) 1:30 - How UDP Packets work (The Envelope Logic) 3:00 - TCP vs UDP: Courier vs Radio Analogy 5:00 - Head of Line Blocking & QUIC 6:15 - The Money Game: Reducing Cloud Costs 7:45 - Connection Pooling (The Airport Taxi Logic) 9:30 - Common Production Mistake: Socket Exhaustion & DNS 10:15 - Security: TLS vs DTLS 11:00 - Conclusion (The R.F.C. Rule) 12:00 - Netflix Interview Question (Homework) 🔗 Keywords & Topics Covered: System Design Basics for Beginners Why Netflix uses TCP vs UDP UDP in Online Gaming vs Streaming Connection Pooling (HikariCP / ADO.NET) Socket Exhaustion and IHttpClientFactory 👨💻 About Me: I am a Software Architect aiming to turn Coders into Architects. We talk about System Design, Scalability, and Real world Engineering problems. #SystemDesign #TCPvsUDP #SoftwareArchitecture #NetflixEngineering #BackendDevelopment #Networking #ZeroToArchitect