This interactive scatter plot visualizes car data from the UCI Auto MPG dataset, with points colored by country of origin (USA, Japan, Germany). Users select which numeric columns to plot on the x and y axes via dropdown menus, and can click the color legend to highlight or dim points by origin. Built with D3 v5, it uses `scaleLinear` for axes, `axisLeft`/`axisBottom` for grid lines, and SVG rendering with hover tooltips showing car names.