This scatter plot matrix visualizes the relationships between four numeric flower measurements—sepal length, sepal width, petal length, and petal width—with points colored by species. The grid layout shows pairwise comparisons, with each cell plotting one measurement against another. The code uses D3.js v7, including `scaleLinear`, `scaleOrdinal`, `schemeSet1`, and axes created with `axisLeft` and `axisBottom`. Data is loaded from a CSV file and parsed manually. On mouseover, a yellow highlight class is applied to the circles in each cell, emphasizing the points.