TCP vs. UDP: Key Differences, Speed & When to Use
TCP is a connection-oriented protocol that guarantees every packet arrives intact and in order; UDP is connectionless, sending data without handshakes or error recovery.
People mix them up because both ride the Internet, but think of TCP as certified mail and UDP as shouting across a crowded room. Streamers swear by UDP’s speed; bankers cling to TCP’s reliability.
Key Differences
TCP establishes a connection, uses acknowledgments, retransmits lost packets, and maintains order. UDP blasts packets out, skips checks, and leaves error handling to the application.
Which One Should You Choose?
Use TCP for web pages, email, file transfers. Pick UDP for live video, online gaming, DNS queries—anywhere a few lost pixels beat a five-second delay.
Examples and Daily Life
Zoom calls use UDP for video; if a frame drops, life goes on. Your bank’s website uses TCP so every digit of your balance is correct.
Does Netflix use TCP or UDP?
TCP for the app; adaptive streaming layers may use UDP for speed.
Can I switch between them manually?
Only by choosing apps or configuring servers; the protocol is baked into each service.