title: What is a require("http") in node.js
body: <p>While learning node.js I read that </p>
  
  <p>We use require directive to load http module and store returned HTTP<br> instance into http variable as follows −</p>
  
  <pre><code>var http = require("http");
  </code></pre>
  
  <p>I want to know what does <code>http</code> module means ?</p>