This scatter plot visualizes car data from the UCI Auto MPG dataset, with each circle representing a car. Users can select which numerical columns to compare on the x and y axes using dropdown menus, and can click the color legend to highlight cars from the USA, Japan, or Germany. Built with D3 v5, the visualization uses `scaleLinear`, `scaleOrdinal`, `axisLeft`, `axisBottom`, and custom `dropdownMenu` and `colorLegend` modules to render the interactive SVG chart.