analyticsvidhya.com - Winston Chang. Data visualization enables a person to express & analyze their findings using shapes & colors, not just in tables. Having a solid understanding of charts, when to use which chart, how to customize a chart and make it look good, is a key skill of a data scientist. This book doesn’t bore you with theoretical knowledge, but focuses on building them in R using sample data sets. It focuses on ggplot2 package to undertake all visualization activities.