This bubble chart visualizes the correlation between average horsepower, torque, and highway MPG for various car makes, with each bubble’s size encoding fuel efficiency and its color representing the manufacturer. Built with D3 v7, it uses `d3.csv` to load the dataset, `d3.scaleLinear` for axes and bubble sizing, and `d3.scaleOrdinal` for color mapping. Circles are rendered as SVG elements with tooltips on mouseover, while legends for both bubble size and make colors are included. Hover interactions are managed via event listeners, and the chart animates tooltip transitions.