title: What is EVENT_TYPE and EVENT_VALUE in Amazon Personalize?
body: <p>I am creating a recommendation engine using Amazon Personalize. I have to send it following data for it,</p>
  
  <pre><code>USER_ID,ITEM_ID,EVENT_TYPE,EVENT_VALUE,TIMESTAMP
  </code></pre>
  
  <p>I don't understand what <code>EVENT_TYPE</code> and <code>EVENT_VALUE</code> is in it.</p>