A scatter plot of the Iris dataset maps petal length against sepal width, with each point colored by species. Hovering over a species name in the color legend dims all other points to highlight the selected group. The visualization uses React hooks to manage hover state and re-render the SVG, with scales from d3.scaleLinear and d3.scaleOrdinal. Axes and legend ticks are built from reusable React components, and the data is loaded via d3.csv.