With iOS 9, Apple introduces the iPad to split-screen multitasking. Also called Slide Over, this new function is supported by the iPad Air, iPad Air 2, iPad mini 2, and iPad mini 3 and later. Located on the right edge of the screen and designed to run multiple apps, Slide Over allows you view another app without leaving the one you're in; however, the two applications won't run together side by side unless you have an iPad Air 2 or later.
To turn on this function, open Settings.
Select General; tap Multitasking.
Turn on, Allow Multiple Apps. 
Swipe left from the right edge to open the Slide Over.
Swipe down to exit an opened app and return to Slide Over menu. Double tap outside the overlay to exit.
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