This bubble chart visualizes the correlation between average horsepower, torque, and highway MPG across various car makes. Each circle's x-position maps to horsepower, y-position to torque, and both its radius and color encode highway MPG, with a legend for size and color. The D3.js v7 code reads from a CSV file and renders an SVG with axis labels and a black tooltip. The visualization includes interactive hover effects, changing circle opacity and stroke width to display the car make.