Boxplot

A boxplot turns the five-number summary into a picture: a box spans $Q_1$ (the first quartile) to $Q_3$ (the third quartile), a line inside marks the median, and whiskers reach the smallest and largest non-outlier values. For example, a longer right whisker signals a right-skewed distribution. Points more than $1.5 \times \text{IQR}$ beyond the nearer quartile are drawn separately as outliers. Boxplots make it easy to compare center and spread across several groups side by side.