This document provides an introduction to data visualization and the Tableau tool. It discusses why visualization is important for understanding relationships in data and detecting trends. The key steps in visualization are outlined, such as preparing data, selecting a tool, transforming data, and identifying KPIs. Tableau is highlighted as a popular tool because it has an easy drag-and-drop interface and does not require programming. Tableau offers desktop, online, prep and server products. Examples are given of different chart types like bar graphs, scatter plots, and maps that can be created in Tableau.