This interactive scatter plot lets users explore the relationship between any two variables from the auto-mpg dataset by switching columns via dropdown menus. Rendered as an SVG with D3 v5, the visualization uses `scaleLinear` for axes and `dropdownMenu` to bind selections to x and y coordinates. The code parses numeric fields with `+d.mpg` and updates the plot dynamically through callbacks, demonstrating reusable D3 components for data-driven comparisons.