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A DFD represents the logical or physical flow of data from its source to its final destination. It focuses on the of the data movement rather than the how of technical implementation. Core Components :

: Breaks down the context diagram into major subprocesses, revealing more of the system's internal workings. dfd.rar

: Sources or destinations outside the system boundaries. A DFD represents the logical or physical flow

To manage complexity, DFDs are organized into levels of increasing detail: such as databases or files.

: Actions that transform incoming data into outgoing information.

: Repositories where data is held for later use, such as databases or files.