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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   socket
      <networking> The Berkeley Unix mechansim for creating a
      virtual connection between processes.  Sockets interface
      Unix's standard I/O with its network communication
      facilities.  They can be of two types, stream (bi-directional)
      or datagram (fixed length destination-addressed messages).
      The socket library function socket() creates a communications
      end-point or socket and returns a file descriptor with which
      to access that socket.  The socket has associated with it a
      socket address, consisting of a port number and the local
      host's network address.
      Unix manual page: socket(2).
      (1995-01-31)