In the next version of iOS, the iPad will be able to open several “copies” of the same app. You can then switch between them, treating them just like any other individual apps, or you can combine these instances with other apps.
For example: You could have one “space” with your Mail app and your to-do app in a 50:50 Split View. And then you can have another space with a different instance of your Mail app and, for instance, the Notes app. Each version of the Mail app can show a different folder or message.
You can even have two versions of, say, the Maps app, sharing the same screen, showing totally different places. It’s a powerful addition to iPad multitasking. Let’s see it in action.