The new Health app in iOS 8 allows users to track their activity, calories and more. With HealthKit, third-party apps can share data with each other, letting users see a more complete picture of their health.
Past all of this, Health brings something long-needed to iOS: Medical ID.
For the uninitiated, a Medical ID is a tag, bracelet or some other item that contains vital information if the owner is in an accident or unable to respond or communicate. I wear a waterproof one when cycling, and my son wears one sharing critical facts about his situation that an EMT or other medical professional may need to know if no one can communicate to them.