As people use their smartphones more and more for productivity tasks, the ability to do more than one thing at a time becomes paramount. On Apple's iPhone 5, multitasking consists of simply switching tasks and hoping your visual memory is good enough to recall what you'd seen in one app after you move on to work in another.
Samsung takes a different approach, allowing you to have a more desktop-like multitasking experience on its flagship phone. The Galaxy S4's dual-view feature lets you run two apps side-by-side so you can, for example, compose an email to your wife about the house you want to buy while looking at its real estate listing page in the browser. Using the S4's Pop Up Play feature, you can watch a video on part of the screen while you keep working on your business presentation in a layer beneath it.