This example pairs a force-directed node-link diagram with an adjacency matrix to explore network structure. The graph layout is computed using `d3.forceSimulation` with `d3.forceLink` and `d3.forceManyBody` forces, and users can drag nodes or zoom via `d3.zoom`. Clicking a node highlights its corresponding row and column in the matrix, and clicking a matrix cell highlights the linked edge. Node colors encode group membership, while edge thickness reflects link weight.