In certain situations, we want to provide more information in one graph. This is when we can combine two (or sometimes even more) types of charts. A classic example of a combo chart is the combination of an area or bar chart with a line chart.

To combine two types of charts, we need to add a secondary axis. In the example in which we combine an area and a line chart, we can use the primary vertical axis to display the area scale, while the secondary axis allows us to display the scale necessary for the line chart.

Some other related topics you might be interested to explore are Line Chart and Area Chart.

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