Data Flows
DFDs show the flow of data from external entities into the system, showed how the data moved from one process to another, as well as its logical storage. There are only four symbols:
1. Squares representing external entities, which are sources or destinations of data.
2. Rounded rectangles representing processes, which take data as input, do something to it, and output it.
3. Arrows representing the data flows, which can either, be electronic data or physical items.
4. Open-ended rectangles representing data stores
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