The part of an application program that performs the required data processing of the business. It refers to the routines that perform the data entry, update, query and report processing, and more specifically to the processing that takes place behind the scenes rather than the presentation logic required to display the data on the screen (GUI processing). Client applications are made up of a user interface and business logic. Server applications are mostly business logic.
Both client and server applications also require communications links, but the network infrastructure, like the user interface, is not part of the business logic.
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