How can I design Data flow diagram (DFD) of any project?

Data flow diagram defines the flow of the data among modules. So, we should about some essential symbols of DFD that represent DFD:

1.       External Entity: Inputting data to be system.

                                                                                          

                                                                            

                                                                                  External Entity

                   

2.       Process/ Function:

 

3.       Data Store: Logical file data structure/file disk

 

4.       Dataflow:

 

5.       Output:

 

                        

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