Box-and-whisker diagram

A box-and-whisker diagram (or box plot) gives us a high-level overview of the distribution of a data set. Key features include:

• The minimum and maximum values.
• The first quartile.
• The median (or second quartile).
• The third quartile.

Observe that $Q_3-Q_1$ is referred to as the interquartile range, which is expressed by the range covered by the boxes.