This bubble chart visualizes the correlation between average horsepower, torque, and highway MPG across 31 car makes. Each circle’s position encodes horsepower (x-axis) and torque (y-axis), while its radius represents highway MPG and its color distinguishes the manufacturer. The code uses `d3.csv` to load data, `d3.scaleLinear` for axes and bubble size, and `d3.scaleOrdinal` with interpolated turbo colors for categorical mapping. Interactive tooltips appear on `mouseover`, and a legend explains both bubble size and color groups. The SVG render includes animated transitions on hover via CSS opacity changes.