title: How does Express work?
body: <p>I am learning MEAN stack and learnt how it starts like,</p>
  
  <pre><code>var http = require('http'),
      express = require('exress'),
      app = express();
  app.listen(8080);
  </code></pre>
  
  <p>and I type node example.js on terminal then I can check it on the Web browser. If I stop process on terminal(in my case, it is ctrl + C), it does not show up on the Web browser. So I wonder if I use MEAN stack cloud server(like aws or digitalocean), should I have to keep terminal which connects cloud server on all the time, so that users can connect my website 24/7 via typing domain?
  Thanks!</p>