A socket is the API endpoint: (IP, protocol, port) on each host. Ephemeral ports (high range) are chosen by the OS for outbound connections; servers bind well-known ports (80, 443, 22). NAT rewrites these tuples — why two peers behind NAT need relays.
Client connects to server
TCP connection
💻Client :ephemeral
🖥️Server :443
🔄NAT box
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