Abstract base class for all other Helpers in CakePHP. Provides common methods and features.
Helpers collection is used as a registry for loaded helpers and handles loading and constructing helper class objects.
Media View provides a custom view implementation for sending files to visitors. Its great for making the response of a controller action be a file that is saved somewhere on the filesystem.
ScaffoldView provides specific view file loading features for scaffolded views.
Theme view class
View, the V in the MVC triad. View interacts with Helpers and view variables passed in from the controller to render the results of the controller action. Often this is HTML, but can also take the form of JSON, XML, PDF's or streaming files.