Stacked and Clustered Column Chart
Stacked column charts are great for displaying the contributions of parts of a whole (eg. how much each product line contributed to the total revenue). Clustered column charts excel at being the most comprehensible while comparing the absolute values visually. With amCharts 4 you can combine both techniques to get the best of both worlds.
An example would be displaying revenues by region (clustered chart) while at the same time including the composition of products that contributed to that revenue (stacked chart).
Demo source