This bubble chart visualizes the correlation between average horsepower, torque, and highway MPG for 31 car makes. Each circle’s position encodes horsepower and torque, while its radius and color represent MPG and manufacturer identity. The SVG renders with d3.scaleLinear axes, a third scale for bubble size, and d3.scaleOrdinal for colors. Interactive tooltips appear on hover, and a dual legend explains the MPG radius and categorical colors. Data comes from `bubblechart.csv`.