This interactive D3.js bubble chart visualizes the relationship between average horsepower, torque, and highway MPG for various car makes. The x-axis represents horsepower, the y-axis represents torque, and the size of each circular marker indicates the vehicle's highway fuel efficiency. Data is loaded from a remote CSV file and rendered as SVG circles, colored by car brand using `d3.scaleOrdinal`. Hovering over a bubble triggers an animated tooltip displaying the exact values, while the radius and opacity scale through `d3.scaleLinear`.