This example presents a force-directed graph of a network, where nodes are positioned by a physics simulation and linked by weighted edges. The visualization couples the graph with an adjacency matrix, allowing users to click a node to highlight its corresponding row and column, or click a matrix cell to highlight the related links. The implementation uses `d3.forceSimulation` with `forceLink`, `forceManyBody`, and `forceCenter` forces, while the matrix is rendered as SVG rects. Node dragging and zooming are also supported.