Multi Window Support in Android N

Android N adds support for displaying more than one app at the same time. On handheld devices, two apps can run side-by-side or one-above-the-other in split-screen mode. On TV devices, apps can use picture-in-picture mode to continue video playback while users are interacting with another app.
In below picture, you can see two apps running side by side.

Data Saver in Android N

In Android N, the user can turn on the option to save data in the settings.

Data Saver mode, a new system service that helps reduce cellular data use by apps, whether roaming, near the end of the billing cycle, or on a small prepaid data pack.

When a user enables Data Saver in Settings and the device is on a metered network, the system blocks background data usage and signals apps to use less data in the foreground wherever possible. Users can white list specific apps to allow background metered data usage even when Data Saver is turned on.