TCP provides an effective abstraction of a reliable network running over an unreliable channel, hiding most of the complexity of network communication from our applications: retransmission of lost data, in-order delivery, congestion control and avoidance, data integrity, and more. When you work with a TCP stream, you are guaranteed that all bytes sent will be identical with bytes received and that they will arrive in the same order to the client. As such, TCP is optimized for accurate delivery, rather than a timely one. This, as it turns out, also creates some challenges when it comes to optimizing for web performance in the browser.
What is the unreliable channel? the physical wire?
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