title: What is the difference between "index, follow" or "follow"
body: <p>what is the differences the lists below:</p>
  
  <pre><code>&lt;meta name="robots" content="index, follow"&gt;
  
  &lt;meta name="robots" content="follow"&gt;
  
  &lt;meta name="robots" content="noindex, follow"&gt;
  
  &lt;meta name="robots" content="index, nofollow"&gt;
  
  &lt;meta name="robots" content="noindex, nofollow"&gt;
  </code></pre>