This bubble chart visualizes the correlation between sepal length, sepal width, petal length, and petal width across three iris species. The x-axis maps sepal length, the y-axis maps sepal width, and petal length controls bubble radius, while color distinguishes species. Built with D3.js v7 and rendered as SVG, it uses `scaleLinear` for axes and bubble sizing, `scaleOrdinal` with `schemeCategory10` for colors, and includes an interactive tooltip on mouseover. The data comes from the classic Iris dataset, loaded via `d3.csv`.