The overall hotel management system is represented by this DFD for the hotel management system. A hotel property management system was traditionally defined as allowing a hotel or group of hotels to manage front-office capabilities such as booking reservations, guest check-in/check-out, room assignment, managing room rates, and billing. A DFD for the hotel management system maps out the information flow for the hotel management system. It shows data inputs, outputs, storage points, and the routes between each destination using defined symbols such as rectangles, circles, and arrows, as well as short text labels. A data flow diagram consists of four basic elements: processes, data stores, external entities, and data flows.