title: What's a PostgreSQL "Cluster" and how do I create one?
body: <p>I am very new to databases, I haven't worked lot on it. Now I want to understand the term database clusters. I googled a lot and found many useful links but I am not able to understand them - maybe because I have very little basic knowledge about databases and also they were in very techy language.</p>
  
  <p>I need advice on these points:</p>
  
  <ol>
  <li>What are database clusters in PostgreSQL?</li>
  <li>How to create clusters in PostgreSQL?</li>
  </ol>