Stack plots are extremely useful when you want to compare multi-series data on the same axis.
Especially when you want to check whether there is some kind of correlation between those variables.
Here is a simple example of a stacked plot, using the matplotlib library.
As we can see we are using the axes.stackplot() method that will plot a stackplot given a list of x values and multiple y as pd.Series.
(e.g. axes.stackplot(x, y1, y2, y3, ...))
In this example, we are plotting the sales per month in dollars and comparing it per year.
Here is the result.
Here you are ! You now know how to make stackplots.
More on plots
If you want to know more about how to add labels, plot different types of plots, etc... check out the other articles I wrote on the topic, just here :