This bubble chart visualizes the relationship between average horsepower, torque, and highway fuel efficiency across 31 car makes. Each circle’s position maps horsepower and torque, while its size represents highway MPG and color distinguishes the brand. Built with D3 v7, the SVG uses `scaleLinear` for axes and bubble radius, plus `scaleOrdinal` for color. Interactive tooltips appear on mouseover, and a legend explains the size and color mappings. Data comes from the included `bubblechart.csv` file.