This scatter chart visualizes the relationship between sepal length and sepal width in the Iris flower dataset. The code combines React with D3 utilities—including `scaleLinear`, `extent`, and `csv`—to load and render data as SVG circles with axis labels. Tooltips appear via native HTML `<title>` elements within each mark, showing the formatted sepal length value. Axes are constructed with custom React components that map D3 scales to SVG grid lines and tick labels.