There was a time when every gadget did something completely different. Your phone was fast and lasted three days in your pocket, but it could only do a few things. Your computer was massively capable, but so big you couldn't lug it anywhere. Everything had a purpose, and they rarely overlapped. But now? Now it's different. You can watch movies, play games, and do Very Serious Work on any number of devices—phone, laptop, tablet—and in lots of different places.