The view layer describes the user interface. Views are defined using XML, which is used by the web client framework to generate data-aware HTML views.
We have menu items that can activate actions that can render views. For example, the Users menu item processes an action also called Users, that in turn renders a series of views. There are several view types available, such as the list and form views, and the filter options made available are also defined by a particular type of view, the search view.
The Odoo development guidelines states that the XML files defining the user interface should be placed inside a views/ subdirectory.
Let's start creating the user interface for our To-Do application.