This interactive bubble chart visualizes the correlation between average torque, horsepower, and highway MPG across 31 car makes. Each circle’s position encodes horsepower and torque, while its radius maps to highway MPG and color distinguishes the manufacturer. Built with D3 v7, the visualization uses `d3.scaleLinear` for axes and sizing, `d3.scaleOrdinal` for colors, and SVG animations for hover effects. A tooltip with mouse events displays the car make, and dual legends show the MPG bubble-size scale and the color-coded brands. Data is loaded from an external CSV file.