This network graph visualizes relationships among cardiovascular diseases, distinguishing broader categories from specific subcategories through connected nodes. A central hub represents Cardiovascular Diseases, with related conditions attached, while links labeled "Subcategory of" connect conditions to their parent categories like Arrhythmias and Aneurysms. The visualization uses D3.js v6 with d3.forceSimulation to position nodes, d3.forceLink for connections, and forceCollide to prevent overlap. Data is loaded from a JSON file, with nodes rendered as blue circles and text labels, plus drag-and-drop interactivity for exploration.