So what is Glass, and how do you use it? Think of Glass as a personalized head-up display and camera that's an extension of your smartphone. Unsurprisingly, there's far greater functionality with Android than with iOS, though Google does plan to support Apple's operating system. The My Glass app hooks into your Google account, where it can access your contacts and Google+ profile. This comes in handy for sharing photos and videos you capture with Glass...over Google+, of course.