A yellow circle follows the mouse cursor across an SVG canvas in this interactive React example. The visualization tracks pointer position using React's `useState` hook and updates the circle's center coordinates through an `onMouseMove` event handler on the SVG element. The `useCallback` hook optimizes the event handler, which reads `clientX` and `clientY` from the mouse event and stores them in state. React re-renders the circle at the new position, demonstrating a simple state-driven interaction pattern in a React and SVG environment.