TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are transport-layer protocols that control how your data moves across networks. Think of TCP as registered mail - it confirms delivery, tracks packages, and makes sure everything arrives safely and in order. UDP is like dropping postcards in a mailbox - faster, lighter, but no delivery guarantee.
Real-world examples:
✅ Use TCP for: Web traffic, file downloads, SSH, email, database connections
✅ Use UDP for: Video conferencing, online gaming, DNS queries, live streaming
The code difference is simple (as shown in the video), but the impact is massive. If you're using frameworks and APIs, the choice is often made for you. But if you're building low-level systems, custom protocols, or optimizing performance - this knowledge is essential.
Whether you're a CS student, junior dev, or just tech-curious, understanding these fundamentals will change how you think about the internet.
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