Launch / Loading Screen
Used so promote the branding of the application.
Allows the design to have more space without taking up screen space. Rather it is a hidden section, accessed through user gestures, like the hamburger menu.
Similar to a tray where it holds hidden content, lists are used for individual pages to show the user they are getting deeper into a particular piece of content. The list can also enhance images where selecting an image can enlarge it. Sharing buttons or social media buttons are a big example of lists.
The launch, tray and list are important design interfaces that can be used to simplify your app without removing content. The loading screen is used to promote the business brand, while also entertaining the user while assets are loading. The tray is used mainly for navigation of global features and the lists are used for individual pages with large amounts of content that don’t need to be shown instantly.