title: What's the difference between Cluster and Instance in AWS Aurora RDS
body: <p>I guess the title is pretty objective, but just to clarify:</p>
  
  <p>When you create an Aurora Database Instance, it is asked to give a name for a Database Instance, a Database Cluster and a Database (where the name of the Database is optional, and no databases are created if it is not specified...). When you create another instance, you have to give the name for both again, and neither of them can be the same one as the first ones.</p>
  
  <p>So, what's the difference between an Aurora Database Instance and an Aurora Database Cluster?</p>
  
  <p>Also, can (and when do) you connect to each one of them?</p>
  
  <p>Thanks!!</p>