This interactive scatter plot visualizes the Iris flower dataset, encoding sepal length and width on the x and y axes while color-coding points by species. Hovering over a legend item highlights the corresponding species by fading other points to 20% opacity. Built with React and D3 v6, it uses `scaleLinear`, `scaleOrdinal`, and `extent` for scales, with custom `AxisBottom`, `AxisLeft`, `ColorLegend`, and `Marks` components rendering SVG circles.