1. What is the difference between the render() function from react-dom and the renderToString() function from react-dom/server?
   1. The render() function is only used to sync React component content with the DOM in a browser. The renderToString() function doesn't require a DOM because it renders markup as a string.
2. Routing on the server is necessary because:
   
   3. The router on the server will determine that content is rendered based on the requested URL. This content is then sent to the browser so that the user perceives a faster load time.
3. What function should you use when reconciling server-rendered React markup with React components in the browser?
   
   2. Always use hydrate() when the server sends rendered React components. Unlike render(), hydrate() expects rendered component markup and can handle it efficiently.