This bubble chart from D3 v7 visualizes the correlation between average horsepower, torque, and highway MPG for various car makes. Each bubble’s x-position maps to horsepower, its y-position to torque, and its radius encodes highway MPG, while color distinguishes the car brand via `d3.scaleOrdinal` with the `interpolateTurbo` palette. The chart uses `d3.axisBottom` and `d3.axisLeft` for axes, and an SVG legend explains the bubble-size scale. Interactive tooltips appear on mouseover, and the data comes from a local CSV file.