title: What's the difference between entity, entity type, and entity instance?
body: <p>I need help to differentiate the terminology between an entity, entity instance and entity type, My lecturer uses a slide based on this 
  <a href="http://www.siue.edu/~dbock/cmis450/3-ermodel.htm" rel="nofollow noreferrer">site</a>, and seems to have mixed up the uses of the word, when she refers to an ER diagram she always say ex: EMPLOYEE as an entity, but from the definition isn't it an entity type? thanks in advance.</p>