What is the difference between "connected" and "unconnected"

What is the difference between "connected" and "unconnected" 


  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.

  Calling connect() on the socket simply records the specified address
  and port number as being the desired communications partner. That
  means that send() or write() are now allowed; they use the destination
  address and port given on the connect call as the destination of the
  packet.

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