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)