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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   back-end
      <programming> Any software performing either the final stage
      in a process, or a task not apparent to the user.  A common
      usage is in a compiler.  A compiler's back-end generates
      machine language and performs optimisations specific to the
      machine's architecture.
      The term can also be used in the context of network
      applications.  E.g. "The back-end of the system handles
      socket protocols".
      Contrast front end.
      (1996-04-09)