This interactive scatter plot visualizes the Iris dataset, showing petal length against sepal width with points colored by species. Hovering over a species label in the color legend fades non-matching points to 20% opacity while highlighting the selected group. Built with React and D3 v5, the code uses `scaleLinear`, `scaleOrdinal`, and `csv` for data loading, rendering SVG circles and axes via reusable components. The color legend triggers hover events through React state to dynamically filter and emphasize data points.