Reviewing frameworks
In Chapter 6, Adapting to MVC, we barely introduced the idea of frameworks using the MVC design pattern. In fact, we did not explain what a framework is; we just developed a very simple one. If you are looking for a definition, here it is: a framework is the structure that you choose to build your program on. Let's discuss this in more detail.
The purpose of frameworks
When you write an application, you need to add your models, views, and controllers if you use the MVC design pattern, which we really encourage you to do. These three elements, together with the JavaScript and CSS files that complete your views, are the ones that differentiate your application from others. There is no way you can skip on writing them.
On the other hand, there is a set of classes that, even though you need them for the correct functioning of your application, they are common to all other applications, or at least, they are very similar. Examples of these classes are the ones we have in the...
