A bubble chart visualizes the correlation between average torque, horsepower, and highway MPG across 31 car makes, with circle size encoding MPG and color distinguishing brands. The visualization includes a tooltip on hover and legends for bubble size and categorical colors. Built with D3 v7, it uses SVG rendering, `d3.scaleOrdinal` for color mapping, and `d3.scaleLinear` for axes and bubble radius, reading data from a CSV file.