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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   fork
      <operating system> A Unix system call used by a process
      (the "parent") to make a copy (the "child") of itself.  The
      child process is identical to the parent except it has a
      different process identifier and a zero return value from
      the fork call.  It is assumed to have used no resources.
      A fork followed by an exec can be used to start a different
      process but this can be inefficient and some later Unix
      variants provide vfork as an alternative mechanism for this.
      See also fork bomb.
      (1996-12-08)