title: Difference between q and fq in Solr
body: <p>Someone please give me a decent explanation of the difference between <strong>q</strong> and <strong>fq</strong> in Solr query, covering some points such as -</p>
  
  <ul>
  <li>Do they have the same syntax? </li>
  <li>Do they return same results? </li>
  <li>When to use which one and why? </li>
  <li>Any other differences</li>
  </ul>