This example visualizes a knowledge graph of films, actors, and directors, where nodes represent entities and directed links indicate relationships such as “Acted in” or “Directed.” A force-directed layout using `d3.forceSimulation`, `forceLink`, `forceManyBody`, and `forceCollide` positions the nodes. The SVG rendering includes arrowhead markers for links, with relationship labels placed along translucent paths using `textPath`. The graph loads JSON data and supports zooming and dragging via D3’s zoom behavior and `d3.drag`.