iOS 9 brings a long-awaited Split-Screen multitasking feature to the iPad for the first time, letting users operate two apps simultaneously and bolstering the productivity capabilities of Apple's tablet lineup. There are three different multitasking features that are available on various iPad models: Slide Over, Split View, and Picture in Picture.
Slide Over can be activated within any app by swiping left from the right side of the iPad to bring up a small side pane that displays a secondary app alongside the first app. Slide Over takes up 1/3 of the space, and any app that has built-in multitasking support will appear in the side pane. Swiping downwards on the Slide Over window from the top of the iPad screen will allow you to switch between apps.
Slide Over is not a full multitasking experience because both apps are not active at once. When the side pane is open, the app that's taking up most of the screen is paused and relegated to the background. Slide Over can be used in portrait or landscape mode and is useful for answering a quick message or looking something up in Safari while using another app.
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Article Link: Inside iOS 9: Split-Screen Multitasking for the iPad