A React-based SVG visualization demonstrates mouse interaction by rendering a single yellow circle that follows the cursor. The circle’s position updates on every `mousemove` event within the SVG element, using React’s `useState` hook to track coordinates and `useCallback` to optimize the handler. The app imports React and ReactDOM, renders an SVG of 960×500 pixels, and initializes the circle at the center. The code shows direct state-driven rendering without external data sources or animation libraries.