In this chapter, you learned about the Ember.js controllers. You saw that the Ember.js controllers serve their purpose fully when used to make models available to templates and maintain a nonpersistent state. You learned about how templates, controllers, and models interact with each other and how the framework segregates these components to effectively design your application around that. Then, you saw how Ember.ObjectController and Ember.ArrayController help in decorating a single object and an array of objects, respectively. In the end, you learned about how to manage dependencies between different controllers by using the needs property. In the next chapter, you will see how to make your Ember.js application effectively talk with the backend API server.