This example shows the total profit from a sales records dataset, grouped by region and visualized as a bubble chart, where each circle’s area encodes profit and its color encodes region. The chart uses D3’s `pack` layout for hierarchical bubble clustering and `scaleOrdinal` for color mapping. Hovering over a circle triggers a tooltip with the country name and profit value, implemented via D3’s selection and event handling. The visualization renders to an SVG canvas within a React framework, using `d3.csv` to load and parse the external data file.