Controllers are the conductors of an MVC application, tightly orchestrating the interactions of the user, the model objects, and the views. They are responsible for responding to user input, manipulating the appropriate model objects, and then selecting the appropriate view to display back to the user in response to the initial input.

In this chapter, you've learned the fundamentals of how controllers work in isolation from views and models. With this basic understanding of how your application can execute code in response to URL requests, you're ready to tackle the user interface. We'll look at that next, in Chapter 3: Views.

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