The bubble chart correlates average horsepower, torque, and highway MPG across car makes. Each bubble's x-position represents horsepower, y-position torque, and size encodes MPG, with color distinguishing brands. Built with d3.v7, it uses linear scales for axes and bubble area, an ordinal scale for color, and SVG circles for rendering. Interactive tooltips display the car make on hover, while the legend shows the MPG size mapping. Data is loaded from a CSV file.