A scatter plot visualizes the relationship between car mileage and price, with points colored by fuel type (Petrol, Diesel, Hybrid, Electric). Using D3 v7, the code loads data from a CSV file via `d3.csv`, maps values to numeric types, and renders an SVG with `d3.scaleLinear` axes, `d3.axisBottom` and `d3.axisLeft` labels, and a legend built from unique fuel types. The x-axis begins at zero, while the y-axis domain is padded by 10% to improve point visibility.