This example shows a simple interactive circle that tracks the mouse cursor as it moves across an SVG canvas. Built with React 16.9 and rendered through ReactDOM, it uses the `useState` and `useCallback` hooks to manage and update the circle’s coordinates in response to the SVG’s `onMouseMove` event. The circle’s position is derived directly from the browser’s `clientX` and `clientY` event properties, with no external data source—the visualization is purely a demonstration of state-driven, event-based rendering in a React component.