The box plot is used to visualize the descriptive statistics of a continuous variable. It visually shows the first and third quartile, median (mean), and whiskers at 1.5 times the Inter Quartile Range (IQR)—the difference between the third and first quartiles, above which are outliers. The first quartile (the bottom of rectangular box) marks a point below which 25% of the total points fall. The third quartile (the top of rectangular box) marks a point below which 75% of the points fall.
If there are no outliers, then whiskers will show min and max values.
This is again used in statistical analysis.
