Bar charts use vertical or horizontal data markers to compare individual values. You can use them to compare discrete data or show trends over time.
Grouped bar charts, also known as clustered bar graphs, multi-set bar charts, or grouped column charts, is a type of bar graph that is used to compare values across multiple categories.
Stacked bar charts are useful for comparing proportional contributions within a category. They plot the relative value that each data series contributes to the total.
Bar mekko chart is a variable width stacked bar chart. Use a bar mekko chart as an alternative to a bar chart when you want to explain the impact.