title: How is Akka used in Play?
body: <p><a href="http://www.playframework.com/" rel="noreferrer">Play's home page</a> says:</p>
  
  <blockquote>
    <p>Built on Akka, Play provides predictable and minimal resource consumption (CPU, memory, threads) for highly-scalable applications.</p>
  </blockquote>
  
  <p>I'd like to know exactly how and where Akka is used in Play and what are the consequences of having Play build on top of Akka.</p>