Difference between map and mapAsync
<p>Can anyone please explain me difference between map and mapAsync w.r.t AKKA stream? <a href="http://doc.akka.io/docs/akka-stream-and-http-experimental/2.0.2/scala/stream-integrations.html" rel="noreferrer">In the documentation</a> it is said that </p>

<blockquote>
  <p>Stream transformations and side effects involving external non-stream
  based services can be performed with mapAsync or mapAsyncUnordered</p>
</blockquote>

<p>Why cant we simply us map here? I assume that Flow, Source, Sink all would be Monadic in nature and thus map should work fine w.r.t the Delay in the nature of these ?</p>