What do circles represent on a data flow diagram?

Correct option is C

The correct answer is (c) Transformation Process

Explanation:

• In a Data Flow Diagram (DFD), a circle (or sometimes a rounded rectangle) represents a process.
• A process is a part of the system that transforms incoming data into outgoing information.
• It depicts the business logic or actions taken on the data.
• According to the Gane-Sarson notation, processes are often rounded rectangles, while Yourdon-DeMarco notation uses circles.
• Every circle must have at least one input and one output.

• Rectangles or Squares represent External Entities (Source or Destination).
• Arrows represent Data Flow (the path data takes).
• Open-ended rectangles represent Data Stores (Repositories).

• Represented by squares or rectangles.

• Represented by arrows.

• Represented by two parallel lines or an open rectangle.