What is Data Flow Diagram ?

Data Flow Diagram : Data flow Diagram is Graphical Representation of flow of data in a information system. it is also known as bubble chart . The main Reason why DFD is so popular technique because it is very simple to draw and also simple to understand and it is use . A DFD Model is very limited number of primitive symbol for represent the function of the system and the Data flow.

Type of DFD : data flow diagram are two type

Logical DFD : The logical dataflow diagram describes flow of data though a system.

Physical DFD : The Physical dataflow diagram describe the implemention of the logical data flow.

DFD Symbol :

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important question on Entity Relationship Model(ER Model)

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