This interactive scatter plot visualizes the Iris dataset, mapping petal length against sepal width. Users can hover over the color legend to highlight data points belonging to a specific species, with non-matching points fading to 20% opacity. The visualization is built using React and D3 v5, with SVG rendering. It uses `d3.scaleLinear` and `d3.scaleOrdinal` for scaling, and React state to manage hover interactions.