Behind Every iCloud
With iOS 5, Apple introduced iCloud, the latest in its line of Internet-based tools and services. To the end user, iCloud extends Apple’s previous MobileMe offerings of e-mail, contact management, and Find My iPhone, with iOS backup and restore, iTunes Match, Photo Stream, and Back to My Mac. With iOS 8, iCloud got a major overhaul and now includes a new framework called CloudKit. This provides you with authentication, private and public databases, structures, and asset storage services.
For all the bells and whistles that Apple has built, at its heart iCloud is a cloud-based storage and synchronization service. Its main purpose is to allow users to access their content across all their devices: iPhone, iPad, ...