A bubble chart visualizes the correlation between average horsepower, torque, and highway MPG for various car makes, using data from a CSV file. The x-axis maps horsepower, the y-axis maps torque, and circle size encodes highway MPG, with color distinguishing each make via a color scale. Built with D3 v7, this SVG visualization includes interactive tooltips on mouseover and a legend for both MPG values and color categories. The code uses `d3.scaleLinear`, `d3.scaleOrdinal`, `d3.axisBottom`, `d3.axisLeft`, and event handlers for tooltip interactions.