Welcome to the second edition of “ggplot2: elegant graphics for data analysis”. I’m so excited to have an updated book that shows off all the latest and greatest ggplot2 features, as well as the great things that have been happening in R and in the ggplot2 community the last 5 years. The ggplot2 community is vibrant: the ggplot2 mailing list has over 7,000 members and there is a very active Stack Overflow community, with nearly 10,000 questions tagged with ggplot2. While most of my development effort is no longer going into ggpl ot2 (more on that below), there’s never been a better time to learn it and use it.