This example presents two complementary D3.js visualizations: a hierarchical family tree and a force-directed social network. The family tree uses a `d3.tree` layout with `d3.linkHorizontal` curves to connect nodes representing three generations. The social network applies `d3.forceSimulation` with `d3.forceLink`, `d3.forceManyBody`, and `d3.forceCenter` to position seven interconnected individuals, with draggable nodes. Both visualizations render as SVG elements, and the force graph includes labels beside each node, allowing users to explore relationships through interactive dragging.