This guide provides an introduction to bubble charts and explains how to create them. It covers the basics of bubble charts, including what they are, how to interpret them, and how to create them using various software programs. It also provides tips
From Wikipedia
A bubble chart is a type of chart that displays three dimensions of data. Each entity with its triplet (v1, v2, v3) of associated data is plotted as a disk that expresses two of the vi values through the disk's xy location and the third through its size. Bubble charts can facilitate the understanding of social, economical, medical, and other scientific relationships.