title: Entity and Relationship Set
body: <p>I am confused about "entity set" and "relationship set". I am aware of "entity" and "relationship". Is there any clear example for entity set and relationship set which shows the real use cases of these terms?</p>
  
  <pre><code> ___________            /\           ___________ 
  |           |          /  \         |           |
  |  Teacher  |-------- /Tea \--------|  Student  |
  |___________|         \che /        |___________|
                         \s /                      
                          \/                       
  </code></pre>
  
  <p>In the above diagram Teacher and Student are entities and Teaches is a relationship.</p>