title: What is a natural identifier in Hibernate?
body: <p>While reading through the Hibernate documentation, I keep seeing references to the concept of a <em>natural identifier</em>. </p>
  
  <p>Does this just mean the id an entity has due to the nature of the data it holds? </p>
  
  <p>E.g. A user's name + password + age + something are used as a compound identitifier?</p>