Windows 8.1's new Start screen has tiles to allow you to use apps more easily and check updates, alarms, and information at a glance.
App Tile: Windows Store apps and Desktop apps are arranged and displayed in the tile format.
Desktop Tile: Switch to Desktop.
View All Apps : You can view the list of all apps at a glance.
Screen Scroll: Scroll the Start screen horizontally.
Zoom Out: You can quickly move to an app you want to use by zooming out from the Start screen to see the entire screen at a glance.