Define 'Data Flow Diagram'. Explain the different elements of DFD.

A Data Flow Diagram (DFD) is a graphical representation that depicts the flow of data within a system, emphasizing how information moves between different processes, data stores, and external entities. DFDs are widely used in systems analysis and design to provide a clear and concise visualization of the data flow and processes in a system, making it an essential tool in understanding, documenting, and communicating the architecture and functionality of a system.

DFDs are composed of several key elements, each of which serves a specific purpose in illustrating the data flow within a system:

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