What is the utility of data flow diagram?

Answer 1

A data flow diagram (DFD) is used to show how the data flows through a program. It is used during the design phase to figure out how to get data from its source through all the processing and to its final destination or disposal. It is used later for reference like other design documents are used.

An early equivalent of the data flow diagram was used on Unit Record Punchcard electromechanical data processing machines to show the flow of the decks of cards from machine to machine. The operators referenced these diagrams to make sure they knew where to take each deck of cards next.

A similar diagram called a workflow diagram was developed in the 1920s to show the flow of work through a business or factory.

Answer 2

DFD stands for data flow diagram and is also known as bubble chart.DFD shows data in motion between different processes, process and store or external agent.