This example combines a force-directed graph with an adjacency matrix to visualize network connections. Users can click a node in the graph or a grid cell in the matrix to highlight corresponding links, with the matrix using cell opacity to represent edge weight. The graph is rendered with SVG elements driven by `d3.forceSimulation`, `d3.forceLink`, `d3.forceManyBody`, and `d3.forceCenter`, while the matrix is built from `d3.csv` data. Interactive features include drag-and-drop via `d3.drag` and zooming through `d3.zoom`.