This bubble chart visualizes the relationship between average horsepower, torque, and highway MPG for various car makes. Each circle’s x-axis position represents horsepower, the y-axis represents torque, and its radius encodes highway MPG, with color differentiating car brands. The visualization uses `d3.scaleLinear` for positional and size mapping, `d3.scaleOrdinal` with `d3.schemeCategory10` for color, and `d3.axisBottom` and `d3.axisLeft` for axes. It loads data from `bubblechart.csv` and renders an SVG, including tooltips on mouseover and custom legends for size and color.