Models and views are very important concepts in app architecture. Models are classes that deal with the data for an app, while views are classes that present that data on screen.
In Flutter, the closest analogy we have to views are widgets. Subsequently, a model would be a basic dart class that doesn't inherit from anything in the Flutter framework. Each one of these classes is responsible for one and only one job. Models are concerned with maintaining the data for your app. Views are concerned with drawing your interface. When you keep a clear and strict separation between your models and views, your code will become simpler and easier to work with.
In this recipe, we're going to build the start of our Todo app and create a model graph to go along with our views.
