Multi-window was one of the biggest and most useful additions to Android 7.0 Nougat. It made its debut on Android with the Samsung Galaxy Note 2 all the way back in 2012, but it took a full four years to make its way into stock Android. It's since become a staple for many people; the convenience of watching a YouTube video while simultaneously scrolling through a Twitter or Facebook feed just can't be beat. With the O Developer Preview, Google has improved multi-window by enabling users to maintain a view of the app they've minimized when they head into the launcher, as well as expand or maximize it.

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