A bubble chart shows how average horsepower, torque, and highway MPG correlate for 31 car brands, with each circle’s x-position mapping to horsepower, y-position to torque, and radius to highway MPG. Color encodes the car make, and a tooltip displays the brand on hover. Built with D3 v7, the visualization uses `d3.scaleLinear` for axes and bubble size, `d3.scaleOrdinal` with `d3.interpolateTurbo` for colors, and SVG circles with mouse-event handlers for interaction. Data is loaded via `d3.csv` from a local file.