title: Generating random colors in JavaScript
body: <p>In the code below, the string 'rgb' means what? I don't understand why it's necessary.</p>
  
  <pre><code>function randomColors() {
      var red = Math.floor(Math.random() * 256);
      var green = Math.floor(Math.random() * 256);
      var blue = Math.floor(Math.random() * 256);
      var colors = 'rgb(' + red + ',' + green + ',' + blue + ')';
      return colors;
      }
  </code></pre>