Angular2: Module and Component difference
<p>I don't quite to figure out, why Angular2 have two concepts?</p>

<ol>
<li><p>Module </p></li>
<li><p>Component</p></li>
</ol>

<p>What is the difference between them and which should be the role they would play?</p>

<ul>
<li>When would i need to create a <strong>SubModule</strong>?</li>
<li>When would i need to create a <strong>SubComponent</strong>?</li>
</ul>