title: What is difference between Module Loader and Module Bundler in JavaScript?
body: <p>Can someone provide some information about Module Loaders and Module Bundlers in JavaScript?</p>
  
  <ul>
  <li>What are the differences? </li>
  <li>When should I use a Module Loader and when a Module Bundler? </li>
  <li>Why do we need them at all?</li>
  </ul>