List the five symbols used on a data flow diagram (DFD) and briefly explain what each symbol represents
A process (rectangle with rounded corners) represents transformation of data input(s) into data output(s).
A data flow (straight arrow) represents movement of data among processes, data stores, and external agents.
An external agent (square) represents a person, organization, or system outside the system boundary that supplies or receives data.
A data store (rectangle with one end open) represents data stored for later retrieval.
A real-time link (arrow with a double bend) represents exchange of data between a process and an external agent while the process is executing.
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