This interactive scatter plot displays the Iris dataset, plotting petal length against sepal width with points colored by species. The color legend on the right is interactive: hovering over a species name fades all other points to 20% opacity, highlighting the selected group. The visualization uses React and D3 v6, leveraging `scaleOrdinal` for categorical colors, `scaleLinear` for axes, and SVG circles. Hovering over data points reveals tooltips via SVG `<title>` elements, while the legend’s `onMouseEnter` and `onMouseOut` handlers drive the filtering logic.