TCP vs UDP: How Transport Protocols Determine Speed and Reliability

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TCP and UDP are two core protocols operating at the Transport Layer of the OSI Model, each designed for different networking needs. TCP prioritizes reliability through a three-way handshake, packet acknowledgment, automatic retransmission, and flow control, making it ideal for file transfers, emails, and web browsing. UDP skips these checks entirely, offering connectionless, low-latency transmission suited for real-time applications like video calls and live streaming. The trade-off is clear: TCP guarantees complete data delivery but introduces latency, while UDP is faster but accepts the risk of occasional packet loss. This distinction explains why a downloaded file arrives intact every time, while a video call may occasionally glitch or drop frames.

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ProgrammingDEV Community ·

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