A flow chart is a tool that provides a graphical representation of a process. This chart will make a system easy to understand for everyone that is involved with the project that is underway. If you have a massive and complex project with many entities, data, data sources, data destinations and processes involved, a data flow chart is one of the most effective ways of making sense of all that data. The flowchart mostly concerns itself with the flow of data through the system. It is popularly used in Structured Systems Analysis and Design.