This example shows a directed network graph of countries connected to shared resource categories such as Technology, Healthcare, and Infrastructure. Nodes are circles colored by type—countries in semi-transparent sky blue, resources in a categorical palette—and links use SVG markers for arrows. The layout is computed with d3.forceSimulation, applying forceLink, forceManyBody, and forceCenter, while the code renders SVG elements directly with d3.v7, including a marker definition for arrowheads.