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A database system is, by one definition 4, "a system whose overall purpose is to maintain information and to make that information available on demand." Database systems have evolved as part of a response to the desire to separate concerns. That is, the "application" should be responsible for manipulation of information and for its presentation to a user, and the "database system" should perform application-independent data management operations.
Bowen et al. (Tue,) studied this question.