App developers might also ask for your device’s UUID so that they can provide builds that will only work on that particular device. But if you’re registering a device as part of the Apple Developer Program so you can install beta software, you’ll need it. Normally, you wouldn’t need to know (or access) your UUID.
It’s similar to a serial number in that regard, but whereas serial numbers are used to identify your device by Apple and your cellular carrier, developers usually use the UUID instead. Your Mac, iPhone, and iPad each have one UUID, and no other device shares it.
A UUID is a string of letters and digits that forms a unique pattern.
