This chapter was an introduction to Akka for us. We tried to understand the basic underlying principle of actors. We've covered one of the most important libraries Akka provides, akka-actors. Starting from why we need a library of this sort, to understanding the way we implement Actors in Akka, we covered it all. Then from there, we covered the important supervision strategy in Akka. We talked about and practiced our own custom supervisor strategy. Finally, we had a look at akka-testkit, a testkit provided by Akka. With this, we covered what was needed to understand Akka actors and the basics of it. In the next chapter, we'll focus on how we can handle concurrency in Scala. We know it's importance in modern architecture, so the next chapter will be an exciting one.