title: Does event listeners means host elements too?
body: <p>I'm new to JS, just a dumb question on event listener, I know how to add an event listener, but confused with what really it is, below is some code:</p>
  
  <pre><code>document.getElementById("myBtn").addEventListener("click", function(){
    ...
  });
  </code></pre>
  
  <p>and I was reading a book which says sth like this: 
  <strong>event in the listing is triggered when the mouse button is clicked on the host element, and the event provides its listeners with ...</strong></p>
  
  <p>so can I say the listener in this case is the button element(with id myBtn)? or listener is a property of button element?</p>