Knowledge Visualization organizes cognition so that people can identify patterns, understand trends, and improve intuition. These extraordinary skills are obtained by visualizing a comprehensive model of a system of information.
According to Wikipedia, Knowledge is a familiarity, awareness, or understanding of someone or something, such as facts, information, descriptions, or skills, which is acquired through experience or education by perceiving, discovering, or learning.
Wikipedia defines Visualization as a type of "mental image". It further defines metal image as a representation in a person's mind of the physical world outside that person. It is an experience that, on most occasions, significantly resembles the experience of perceiving some object, event, or scene, but occurs when the relevant object, event, or scene is not actually present to the senses.
Taken together, Knowledge Visualization is a way to organize our understanding of the universe by using the visual language of cognition to describe events in spacetime.