What distinguishes a 'diagram' from other forms of representation?

A diagram is distinct from other forms of representation primarily because it visually represents information in a simplified format. This visual aspect allows complex ideas or data to be conveyed in a way that is easier to understand and interpret at a glance. Diagrams can break down intricate topics into more digestible components, using shapes, lines, and symbols to illustrate relationships, processes, or structures. This makes them particularly useful in educational contexts, as they can enhance comprehension and retention of information.

The other options involve different methods of communication or representation that do not align with the primary function of a diagram. For example, providing a narrative description centers on verbal or written storytelling, while focusing on aesthetic qualities pertains more to artistic expression rather than information representation. Summarizing texts in bullet points organizes information in a concise manner but does not utilize the visual elements that characterize diagrams. Thus, the defining feature of a diagram is its ability to present information visually in a simplified way.