Multitasking is, in a nutshell, doing more than one thing at once. On your iPad, there are several ways you can multitask. The most obvious is Split View, whereby you divide the screen, with one application on one side and another on the other. You can then drag content between them, quickly and easily. You can even open the same application twice if you choose.
To open a second app in Split View, drag up from the foot of the screen to open the Dock, and either drag a second application out of the Dock onto the left or right side of the screen, or tap the App Library, and drag an app