What does an arrow symbolize in a data flow diagram?

In a data flow diagram, an arrow symbolizes the flow of data between different components of the system. This is fundamental to understanding how information is transferred through the processes and how it interacts with data stores and external entities. The arrows effectively represent the movement or transformation of data as it flows from one point to another, indicating the direction of that flow.

Each arrow connects various elements, such as processes, data stores, and external entities, showcasing how inputs are transformed into outputs. This visual representation helps stakeholders see the relationships and dependencies within the system, making it an essential tool in systems analysis and design.