The document discusses Apple's iCloud service. It begins by providing an abstract that outlines some of the key benefits of using iCloud, such as automatically backing up files across devices. It then provides more details on how iCloud works, storing files on remote servers that can be accessed from any device linked to the user's iCloud account. The document also discusses some of the features of iCloud, such as Photo Stream, device backup and restore, and Find My iPhone. It outlines the different types of iCloud (public, private, hybrid) and how iCloud functions to backup user data daily. Finally, it discusses some security concerns with cloud computing services and storing data remotely.