A bubble chart displays the Iris dataset, plotting sepal width on the x-axis against sepal length on the y-axis. Each circle's radius encodes petal length, while its color distinguishes the three species (setosa, versicolor, and virginica) using a custom ordinal scale. Built with d3.v7 and rendered as SVG, the visualization includes interactive tooltips on hover, a legend, and animated opacity transitions for a polished presentation.