A data flow diagram (DFD) shows what about a system?

A data flow diagram (DFD) is a graphical representation that illustrates how data moves through a system. The primary purpose of a DFD is to showcase how input data is transformed into useful information through various processes within the system.

In a DFD, different symbols represent data sources, processes, data stores, and data flows. By following the flow of data from inputs to outputs, one can clearly see the processes that convert raw data into meaningful information, which is essential for understanding the functionality of the system. This depiction is valuable for analyzing and designing systems, highlighting how different components interact and the processes that manipulate the data.

While elements such as data capturing, archiving, and storage are part of a system's data handling, the primary focus of a DFD is on the transformation of input data into information, making it crucial for designers and analysts to visualize the relationship between processes and data flows. This understanding aids in ensuring that systems meet their intended requirements and perform efficiently.