This interactive scatter plot matrix displays the four numeric attributes of the Iris dataset across a grid of pairwise scatter plots, with points colored by species (setosa, versicolor, virginica). The visualization uses D3.js v6 to create the SVG, with `d3.scaleLinear` for axes, `d3.scaleOrdinal` for categorical color mapping, and `d3.brush` to enable brushing—selecting points in one cell highlights the corresponding points across all other cells. Axis tick lines extend across the entire plot for readability, and species labels appear in the top-left area.