Welcome to ggplot2

• ggplot2 has an underlying grammar, based on the Grammar of Graphics (Wilkinson 2005), that allows you to compose graphs by combining independent components.
  
• You can produce publication-quality graphics in seconds. However, ggplot2’s comprehensive themeing system makes it easy to do what you want.
  
• ggplot2 is designed to work iteratively. You start with a layer that shows the raw data. Then you add layers of annotations and statistical summaries.