Graphic designs intended to explain rather than simply represent. For example, in geometry, a diagram may be a figure composed of lines, serving to illustrate a definition or statement, or to aid in the proof of a proposition. In other contexts, a diagram may be any illustrative figure which, without necessarily representing the exact appearance of an object, gives an outline or general scheme of it, so as to explain or exhibit the shape and relations of its various parts

A tabular or graphic representation of a fluctuating or dependent variable, such as magnitude, temperature, cost, etc.