title: What is Express.js?
body: <p>I am a learner in <a href="http://en.wikipedia.org/wiki/Node.js" rel="noreferrer">Node.js</a>.</p>
  <ol>
  <li>What's <a href="https://en.wikipedia.org/wiki/Express.js" rel="noreferrer">Express.js</a>?</li>
  <li>What's the purpose of it with Node.js?</li>
  <li>Why do we actually need Express.js? How is it useful for us to use with Node.js?</li>
  <li>What's <a href="https://en.wikipedia.org/wiki/Redis" rel="noreferrer">Redis</a>? Does it come with Express.js?</li>
  </ol>