What is a widget collection?
Collection widgets specialize in displaying many elements of the same type, such as a collection of pictures from a gallery app, a collection of articles from a news app or a collection of messages from a communication app.
What are the widget views?
App widgets are miniature application views that can be embedded in other applications (such as the home screen) and receive periodic updates. These views are referred to as widgets in the user interface, and you can publish one with an app widget provider (or widget provider).