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
Where as
The ERD, which represents the entity model, shows what the database or system will look like but doesn't explain how to implement it. An ERD is vendor-neutral. It groups data into entities and relates the entities to one another based on business rules. An entity is something that has substance and about which you want to store data. A business rule is a policy or procedure that a business enforces. It describes how the business operates
Where as
The ERD, which represents the entity model, shows what the database or system will look like but doesn't explain how to implement it. An ERD is vendor-neutral. It groups data into entities and relates the entities to one another based on business rules. An entity is something that has substance and about which you want to store data. A business rule is a policy or procedure that a business enforces. It describes how the business operates
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