What is the difference between the dependency direction and the data flow direction?

Dependency direction and data flow direction are different concepts in programming and modeling.

• Dependency direction shows that one element (for example, a module, class, or package) depends on another. This means that a change in the dependent element can affect the element it depends on. Dependency indicates a relationship where one component uses or requires another.

• Data flow direction reflects the movement of data between components or processes. It shows how data is transmitted, transformed, or processed within the system.

Example: In an order processing system, the "Payment Processing" module depends on the "Creditworthiness Check" module (dependency), and the data flow is the transfer of payment information from the client to the system and back.

In Go, for example, dependency is expressed through package imports, and data flow through channels or function parameters.