Data Flow Diagram Defines Graphical / Visualization Diagram of any Task / Business, It is represented as a set of symbols, notations to represent a Diagram.
DFD referred as Structured Systems Analysis and Design Method (SSADM).
Data Flow Diagram Four Type Entity::
“It is a set of four main elements: entity, process, data store and data flow.”
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Que-1:: A Magento Open Source merchant sell toys and gift and wants to improve the experience on their website. The merchant wants to avoid extensions or customization.