Transport Layer Explained | Why Online Payments Need TCP but YouTube Uses UDP? 🤯

Jab Google Pay se payment karte ho aur jab YouTube pe video dekhte ho — dono mein data internet pe hi jaata hai. Phir bhi ek jagah 1 packet bhi lost ho gaya toh problem, aur doosri jagah 2–3 packet miss ho jaaye toh bhi koi tension nahi. 👉 Kyun? Is ek sawaal ka jawab hai OSI Model ki sabse powerful layer — Transport Layer (Layer 4). Is video mein hum Transport Layer ko real-life examples ke saath samjhenge: TCP aur UDP ka actual difference Kab speed important hoti hai, kab reliability Payments, emails aur streaming alag-alag protocol kyun use karte hain Sab kuch simple Hinglish, bina ratta-maar networking. 📌 Topics Covered in This Video: OSI Model Transport Layer Explained (Layer 4) TCP (Transmission Control Protocol) – Reliable Delivery UDP (User Datagram Protocol) – Fast Delivery TCP vs UDP with real-life examples Port Numbers (80, 443, 25) Flow Control & Congestion Control Why Transport Layer is the Heart of OSI Model 🎯 Who Should Watch This Video? Computer Networks beginners Engineering students (CN / OSI Model) Interview preparation (TCP vs UDP) Web developers & backend learners Anyone confused about data reliability vs speed 🧠 One-Line Interview Clarity Reliable chahiye → TCP Fast chahiye → UDP Aur yaad rakho: Transport Layer decide karta hai “kaise bhejna hai.” ▶️ OSI Model Series – Next Video Next part mein hum tod ke samjhenge: 👉 Network Layer — routing, IP address aur packet ka raasta kaise decide hota hai. Series follow karo taaki OSI Model ratta nahi, logic ban jaaye. 🔔 Support the Channel Agar TCP vs UDP clear ho gaya: 👍 Like karo 💬 Comment karo: “Transport Layer samajh aa gayi” 🔔 Subscribe for deep-clarity networking content