a display that does not show quantitative data (numerical data), but rather relationships and abstract information.The essence of a diagram can be seen as: In the specific sense diagrams and charts contrast with computer graphics, technical illustrations, infographics, maps, and technical drawings, by showing 'abstract rather than literal representations of information'. On the other hand, Lowe (1993) defined diagrams as specifically 'abstract graphic portrayals of the subject matter they represent'.

For example, Anderson (1997) stated more generally: 'diagrams are pictorial, yet abstract, representations of information, and maps, line graphs, bar charts, engineering blueprints, and architects' sketches are all examples of diagrams, whereas photographs and video are not'. In science the term is used in both ways. specific kind of visual display : This is the genre that shows qualitative data with shapes that are connected by lines, arrows, or other visual links.visual information device : Like the term ' illustration', 'diagram' is used as a collective term standing for the whole class of technical genres, including graphs, technical drawings and tables.The term 'diagram' in its commonly used sense can have a general or specific meaning: The word graph is sometimes used as a synonym for diagram.

Sometimes, the technique uses a three-dimensional visualization which is then projected onto a two-dimensional surface. Diagrams have been used since prehistoric times on walls of caves, but became more prevalent during the Enlightenment. Further information: ChartĪ diagram is a symbolic representation of information using visualization techniques. For other uses, see Diagram (disambiguation).

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