title: How does react update part of the DOM?
body: <p>I know that this subject has been discussed a lot obviously, but I'm not sure how to research my question that is rather specific and I hope it follows the rules here.</p>
  
  <p>I know that to decide whether to update the DOM or not, react compares the virtual DOM with the re-rendered one. But I just didn't understand if in case it does decide to update it - does it update all the elements of the specific re-rendered component, or does it know to update only the changed elements of the componenet?</p>
  
  <p>Thanks in advance,</p>