This bubble chart visualizes the correlation between average horsepower, torque, and highway MPG across 31 car makes. Each circle’s position encodes horsepower (x-axis) and torque (y-axis), while the radius represents highway MPG and color distinguishes the car brand. The visualization uses d3.csv to load the data, d3.scaleLinear for positioning and sizing, and d3.scaleOrdinal for color mapping. Interactive tooltips appear on mouseover using D3 event handlers, with a legend showing MPG values and car-make color codes.