Data visualization is "the graphical presentation of information, with the goal of providing the viewer with a qualitative understanding of the information contents" (WPI). It uses "visual representations to explore, make sense of, and communicate quantitative data" (Perceptual Edge). "Effective visualization helps users analyze and reason about data and evidence. It makes complex data more accessible, understandable, and usable. ... It is one of the steps in data analysis or data science" (Wikipedia).
"Data visualization is typically achieved by extracting data from the underlying IT system. This data is generally in the form of numbers, statistics, and overall activity. The data is processed using data visualization software and is displayed on the system's dashboard" (Techopedia).
"Data visualization is both an art and a science" (Wikipedia).
A definitive guide to data definitions and trends, from the team at Stitch.