This interactive scatterplot matrix displays the Iris dataset, showing pairwise relationships between four floral measurements. Each off-diagonal cell contains a scatterplot of data points colored by species, while diagonal cells display histograms of individual feature distributions. Users can brush rectangular regions across any plot to highlight corresponding points in all other cells, enabling rapid comparison of multi-dimensional correlations. The visualization is built with D3 v4, using d3.brush for the linked selections, d3.scaleLinear for axes, and d3.axisBottom/Left for tick marks, rendered as SVG.