This bubble chart visualizes car data, plotting horsepower on the x-axis, torque on the y-axis, and using bubble size to represent highway fuel efficiency. Each circle is colored by car make, with a legend identifying the categories. The D3.js v7 code loads a CSV from GitHub, scales the data using `scaleLinear` for axes and bubble radius, and renders the chart as an SVG. Interactive tooltips appear on mouseover, showing the make, horsepower, torque, and highway MPG for each vehicle.