A bubble chart displays the Iris dataset, showing petal length through bubble size and species through color, with sepal length and width on the x and y axes. Hovering over a circle reveals a tooltip with species and petal length. The visualization uses D3.js v7 with SVG rendering, `d3.scaleLinear` and `d3.scaleOrdinal` for mapping, and animated transitions for the tooltip. A legend distinguishes the three Iris species, and the chart includes axis labels and a title.