Final answer:
A set of DFDs is structured like a pyramid, with a general context diagram on top and more specific diagrams below that provide detailed information about processes and data flows within a system.
Step-by-step explanation:
A set of Data Flow Diagrams (DFDs) is like a pyramid with the context diagram at the top. A context diagram is a high-level, simplified view of an entire system or process that encapsulates all the external entities and the flows of data between the system and the entities. As you move down the pyramid, the diagrams become more detailed, showing specific processes, data stores, and data flows within the system. This hierarchy from general to specific helps in understanding how data moves through the system and is essential in systems analysis and design. DFD levels are used to gradually reveal details of the system as needed without overwhelming the viewer with too much information at once.