DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   black box
      <jargon> An abstraction of a device or system in which only
      its externally visible behaviour is considered and not its
      implementation or "inner workings".
      See also functional testing.
      (1997-07-03)