A Clustered and Stacked Bar Chart is useful when you want to display multiple sets of data in one chart. This type of chart allows you to see how each set of data contributes to the overall total, as well as compare the individual values within each set. This can be helpful when analyzing data from different categories or time periods. For example, you could use a Clustered and Stacked Bar Chart to compare sales figures for different products in a given year. Or, you can use it to analyze the percentage of time spent on different tasks by employees in a particular department. Overall, a Clustered and Stacked Bar Chart is a great way to showcase information to a wider audience.