This interactive bubble chart visualizes the Iris dataset, plotting sepal length against sepal width for 150 flowers. Each bubble’s size encodes petal length, while its color distinguishes the three Iris species, with a legend on the right. Built with D3.js v7, the visualization uses `d3.scaleLinear` for axes and bubble size, `d3.scaleOrdinal` with `d3.schemeCategory10` for colors, and SVG `circle` elements. Hovering reveals a tooltip showing species and sepal measurements, with smooth transitions on mouseover.