This article explains a Banking System Data Flow Context Diagram and its use in IT Infrastructure. A data flow context diagram is a visual representation of data flow detailing inputs, outputs and processes of a banking system. It helps to understand banking system's data flow relationship, the transmission of data and its interaction with other systems. Using this diagram, one can easily identify gaps or critical issues in the banking system’s IT Infra. It also helps to develop a secure, consistent and efficient banking system across all its operational functions.