A diagram is a symbolic representation of information according to some visualization technique. Diagrams have been used since ancient times, but became more prevalent during the Enlightenment.^[1] Sometimes, the technique uses a three-dimensional visualization which is then projected onto a two-dimensional surface. The word graph is sometimes used as a synonym for diagram.

There are at least the following types of diagrams:

• Chart-like diagrams, which take a collection of items and relationships between them, and express them by giving each item a 2D position, while the relationships are expressed as connections between the items or overlaps between the items; examples of such techniques:

tree diagram   network diagram   flowchart   Venn diagram   existential graph

• Graph-based diagrams; these display a relationship between two variables that take either discrete or a continuous ranges of values; examples:

histogram   bar graph   pie chart   function graph   scatter plot

Schematics and other types of diagrams, e.g.,

train schedule diagram   exploded view   population density map   Pioneer plaque   Three-dimensional diagram

Many of these types of diagrams are commonly generated using diagramming software such as Visio and Gliffy. Thousands of diagram techniques exist. Some more examples follow.

Diagrams may also be classified according to use or purpose, for example, explanatory and/or how to diagrams.

you can also make a diagram with COGGLE : https://coggle.it/

you can view my diagram in : https://coggle.it/diagram/WqsjptMJtAYJ090z/t/search-engines