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What is the difference between “connected” and “unconnected” sockets?

April 26, 2017connected Sockets unconnected

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What is the difference between “connected” and “unconnected” sockets?

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From Andrew Gierth (andrew@erlenstar.demon.co.uk): If a UDP socket is unconnected, which is the normal state after a bind() call, then send() or write() are not allowed, since no destination address is available; only sendto() can be used to send data.