SlideOver slides out from the right for quick access to a supported app. Sliding it back to the right closes the panel and returns you to the main app.
SlideOver is a good way to check Twitter while in another app.
Another look at Twitter in the panel.
Sliding the panel open while in the Zite app.
Splitting the screen between Safari and OneNote for taking notes.
In Split View the display can be shared as above or equally shared half and half.
Microsoft apps use Split View well, including Outlook and OneNote.
Split view is good for working in the Outlook calendar and a second app.
Using Mail in Split View with a second app onscreen is productive.
The Microsoft Office apps work well in Split View as demonstrated in this display with Excel and PowerPoint.
You wouldn't normally be using two mail apps in Split View but this screen shows how you could compare two similar apps to see which UI you prefer.