title: Play 2.5 What is akka.stream.Materializer useful for?
body: <p>I started to use Play 2.5 recently, and I was wondering what the purpose of doing the following was: </p>
  
  <pre><code>@Inject() (implicit val mat: Materializer)
  </code></pre>
  
  <p>I had several pieces of code not working and solved that issue thanks to this, but I still don't see what the materializer is doing.</p>
  
  <p>Thanks</p>