This bubble chart visualizes the correlation between GDP per capita, life expectancy, and population area ratio across 20 countries. Each circle’s position encodes GDP per capita (x-axis) and life expectancy (y-axis), while its radius represents population density. The visualization uses D3 v7 with SVG rendering and interactive tooltips that display country-specific values on hover. A categorical color scale distinguishes countries, paired with a legend. The chart reads data from a CSV file and animates tooltip transitions, with circle opacity increasing on mouseover for enhanced readability.