iCloud is a cloud storage and cloud computing service from Apple Inc., which has over 100 million users. The service allows users to store data such as music files on remote computer servers for download to multiple devices such as iOS-based devices, and personal computers running Mac OS X or Microsoft Windows. It also replaces Apple’s MobileMe service acting as a data syncing center for email, contacts, calendars, bookmarks, notes, to-do lists, and other data.
Cloud is the latest branding of Apple’s cloud computing services. It has previously been branded as iTools in 2000,.Mac in 2002, and MobileMe in 2008.
The cloud-based system allows users to store music, photos, applications, documents, bookmarks, reminders, backups, notes, iBooks, and contacts, as well as serving as a platform for Apple’s email servers and calendars. Third-party iOS and OS X app developers are able to implement iCloud functionality in their apps through the iCloud API.
iCloud allows users to back up iOS devices online; they can be restored from backup without connecting to a computer.