This document introduces infographics and data visualization. It defines infographics as visual representations of information used to support and strengthen information in a sensitive context, while data visualization visually displays measured quantities using points, lines, and other graphical elements. The document provides examples of effective data visualization patterns and preattentive variables that convey information preattentively. It also discusses interactivity and categories of visualization, looking at examples from Descry, Gapminder, and Google Visualization.