Android N is the developer preview of Android Nougat.
The developer preview of Android N, is the successor version of Google's Android mobile operating system Android Marshmallow. These build on Android N’s predecessor, Android Marshmallow, right out of the box (and more new stuff will arrive in coming previews). One highlight of this initial preview is a split-screen mode that works in both portrait and landscape orientations on smartphones and tablets.
For More: First Preview of Android N: Developer APIs & Tools