This interactive scatter plot visualizes the classic Iris dataset, using color to distinguish species. A legend with circles and text labels enables hovering to highlight a selected species and fade the others, while also adjusting axis opacity. Users can swap the X and Y axes between sepal and petal measurements using dropdowns and a swap button. Built with React and D3 v6, the visualization uses `scaleLinear`, `scaleOrdinal`, `extent`, and `cs` for data loading and rendering SVG marks and axes.