A key feature that makes the iOS 8/Yosemite combination so powerful is Handoff, a scheme that lets you transfer tasks from one device to another. This lets you start working on something in one device, and then smoothly and seamlessly take up the same task on another--start on an iPhone and then move to your Mac, for example. iOS 8 already let you use Handoff between an iPhone and an iPad, but now with the launch of Yosemite, your Mac can get in on the fun too.
