Bubble

Bubble charts are useful for spotting relationships between metrics and comparing specific data points. In terms of functionality and purpose, a bubble chart is similar to a bar line chart, but offers more specific visual cues for certain data sets. Each bubble represents a plotted XY point at its center, and the Z axis controls the diameter of the bubble. For example, a sales chart might have the top 5 bestselling product names for the X axis, number of units sold as the Y axis, and total sales revenue for each product for the Z axis.

An example of a bubble chart.