This bubble chart compares GDP per capita, life expectancy, and population area ratio across 20 countries. Each circle’s position maps to the x- and y-axes, while its radius encodes population density, and its color distinguishes countries. Hovering reveals a tooltip with exact values. The visualization uses d3.csv to load data, d3.scaleLinear for axes and sizing, d3.scaleOrdinal with schemeCategory10 for colors, and SVG circles with mouse events for interaction.