A Data Flow Diagram (DFD) is a graphical representation of data flows in a ticket reservation system. It can be used by software developers to visualize the different processes of the system, such as user interactions, data collection and storage, and data transforming. DFDs can help identify latency and bottlenecks that might occur as data moves from one step of the ticketing process to another. Additionally, DFDs provide a clear overview of how data inputs to a system are handled and what kind of output users can expect from the system. By understanding how a ticketing system works, developers can discover and avoid potential issues, leading to improved software development.