ICloud

iTunes MatchiCloud DriveiCloud KeychainiWork for iCloudApple iCloudiCloud Photo LibraryPhoto StreamApple iWork for iCloudApple MobileMeFind My iPhone
iCloud is a cloud storage and cloud computing service from Apple Inc. launched on October 12, 2011.wikipedia
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Apple Inc.

AppleApple ComputerApple Inc
iCloud is a cloud storage and cloud computing service from Apple Inc. launched on October 12, 2011.
Its online services include the iTunes Store, the iOS App Store, Mac App Store, Apple Music, Apple TV+, iMessage, and iCloud.

MacOS

Mac OS XOS XMac
iCloud enables users to store data such as documents, photos, and music on remote servers for download to iOS, macOS or Windows devices, to share and send data to other users, and to manage their Apple devices if lost or stolen.
With increasing popularity of the internet, Apple offered additional online services, including the .Mac, MobileMe and most recently iCloud products.

Maiden, North Carolina

MaidenMaiden, NC
One of Apple's original iCloud data centers is located in Maiden, North Carolina, US.
Maiden was the first public high school in the state with an observatory and is currently home to an Apple iCloud Data Center, covering 500000 sqft.

OS X Mavericks

OS X 10.910.9Mavericks
For example, using iCloud Photo Sharing requires OS X Mavericks v10.9 or above on a Mac. From iOS 7 and OS X Mavericks, the iTunes Radio function will be available across devices, including integration with the Music app, both on portable iOS devices and Apple TV (2nd generation onwards), as well as inside the iTunes app on Macintosh and Windows computers. Third-party developers have reported that the changes implemented in the release of iOS 7 and OS X Mavericks (version 10.9) address these iCloud criticisms.
The update emphasized battery life, Finder improvements, other improvements for power users, and continued iCloud integration, as well as bringing more of Apple's iOS apps to OS X. Mavericks, which was named after the surfing location in Northern California, was the first in the series of OS X releases named for places in Apple's home state; earlier releases used the names of big cats.

MobileMe

.MaciTools
iCloud replaced Apple's MobileMe service, acting as a data syncing center for email, contacts, calendars, bookmarks, notes, reminders (to-do lists), iWork documents, photos, and other data. At the WWDC 2011 keynote speech, Steve Jobs (in one of his last public appearances) announced iCloud will replace MobileMe services and that the basic iCloud service will be free of charge.
MobileMe (branded iTools between 2000 and 2002; .Mac until 2008) is a discontinued subscription-based collection of online services and software offered by Apple Inc. All services were gradually transitioned to and eventually replaced by the free iCloud, and MobileMe ceased on June 30, 2012, with transfers to iCloud being available until July 31, 2012, or data being available for download until that date, when the site finally closed completely.

IWork

iWork.comApple iWorkiWork '09
During the 2013 Apple Worldwide Developers Conference (WWDC) keynote speech, iWork for iCloud was announced for release at the same time as the next version of the app versions of iWork later in the year. The three apps for both iOS and macOS that form Apple's iWork suite (Pages, Numbers, and Keynote), will be made available on a web interface (named as Pages for iCloud, Numbers for iCloud, and Keynote for iCloud respectively), and accessed via the iCloud website under each users iCloud Apple ID login.
iWork is an office suite of applications created by Apple Inc. for its macOS and iOS operating systems, and also available cross-platform through the iCloud website.

Find My Phone

phone finder
Similar phone finder services under various names are available for other families of smartphones.
Apple offers a free service called Find My iPhone for iPhones running iOS.

IOS 8

iOS 8.1iOS 8.48.1
iCloud Photos is a feature on iOS 8.1 or later and OS X Yosemite (version 10.10) of later, plus web app access.
App updates in the release included the new Health app, which can aggregate data from different fitness apps, as well as enabling a Medical ID accessible on the lock screen for emergencies; support for iCloud Photo Library in the Photos app, which enables photos to be synchronized and stored in the cloud; and iCloud Drive, which lets users store files in the cloud and browse them across devices.

Pages (word processor)

PagesApple Pages.PAGES
The three apps for both iOS and macOS that form Apple's iWork suite (Pages, Numbers, and Keynote), will be made available on a web interface (named as Pages for iCloud, Numbers for iCloud, and Keynote for iCloud respectively), and accessed via the iCloud website under each users iCloud Apple ID login.
On October 12, 2011, Apple updated the iOS app to version 1.5, adding the iCloud "Documents in the Cloud" feature.

Safari (web browser)

SafariApple SafariSafari web browser
Synchronization of bookmarks requires Safari 5.1.1 or later on macOS, and Internet Explorer 9, Firefox 22 or Google Chrome 28 or later on Windows.

Apple TV

AppleTVApple TV 4KApple TV Software
From iOS 7 and OS X Mavericks, the iTunes Radio function will be available across devices, including integration with the Music app, both on portable iOS devices and Apple TV (2nd generation onwards), as well as inside the iTunes app on Macintosh and Windows computers.

Apple Worldwide Developers Conference

WWDCWorldwide Developers ConferenceWorld Wide Developers Conference
During the 2013 Apple Worldwide Developers Conference (WWDC) keynote speech, iWork for iCloud was announced for release at the same time as the next version of the app versions of iWork later in the year. iCloud was announced on June 6, 2011, at the 2011 Apple Worldwide Developers Conference (WWDC). At the WWDC 2011 keynote speech, Steve Jobs (in one of his last public appearances) announced iCloud will replace MobileMe services and that the basic iCloud service will be free of charge.
In the keynote, Apple unveiled redesigned models of the Mac Pro, AirPort Time Capsule, AirPort Extreme, and MacBook Air, and showcased OS X Mavericks, iOS 7, iWork for iCloud, and a new music streaming service named iTunes Radio.

Mail (Windows)

MailMail on Windows 10Windows Mail
Synchronizing with a PC requires Windows 7 or later and using the iCloud Control Panel, and optionally Outlook 2007 or later or the built-in Windows 10 Mail and Calendar apps to sync Calendar, Contacts and Reminders.
Mail has preset server configurations for Outlook.com, Office 365, Gmail, iCloud, and Yahoo! Mail.

ITunes Radio

ItunesApple Radio's Beats 1Apple's iTunes Radio
From iOS 7 and OS X Mavericks, the iTunes Radio function will be available across devices, including integration with the Music app, both on portable iOS devices and Apple TV (2nd generation onwards), as well as inside the iTunes app on Macintosh and Windows computers.
iTunes Match subscribers could be able to use an ad-free version of the service.

Steve Jobs

JobsSteven Jobsdied
At the WWDC 2011 keynote speech, Steve Jobs (in one of his last public appearances) announced iCloud will replace MobileMe services and that the basic iCloud service will be free of charge.
While on leave, Jobs appeared at the iPad 2 launch event on March 2, the WWDC keynote introducing iCloud on June 6, and before the Cupertino City Council on June 7.

OS X Yosemite

OS X 10.10OS X 10.10 Yosemite10.10 Yosemite
iCloud Photos is a feature on iOS 8.1 or later and OS X Yosemite (version 10.10) of later, plus web app access.
Many of Yosemite's new features focus on the theme of continuity, increasing its integration with other Apple services and platforms such as iOS and iCloud.

ICloud leaks of celebrity photos

2014 celebrity photo hackRyan Collins2014 celebrity photo leaks
The exploit was later incorrectly rumored to have been used as part of an August 2014 leak of a large number of private, nude photos of celebrities that had been synced to their iCloud storage from their iPhone.
The images were initially believed to have been obtained via a breach of Apple's cloud services suite iCloud, or a security issue in the iCloud API which allowed them to make unlimited attempts at guessing victims' passwords.

IOS 7

iOS7iOS 7.0iOS 7.1
Third-party developers have reported that the changes implemented in the release of iOS 7 and OS X Mavericks (version 10.9) address these iCloud criticisms.
It also included support for iCloud Keychain, a password generator for the Safari web browser, updated the lock screen with a delay of the "Slide to Unlock" text when Touch ID is in use, and many bug fixes.

Comparison of online music lockers

online music lockercloud music servicesonline music lockers
There were three large services—Amazon Music, Apple's iTunes Match, and Google Play Music —each incorporating an online music store (see comparison), with purchased songs from the associated music store not counting toward storage limits.

IOS 11

11iOS 11.0iOS 11.3
In iOS 11, iCloud Drive has been integrated into the new Files app, replacing the standalone iCloud Drive app.
Personalized suggestions will help the user free up storage space on their device, including emptying Photos trash, backing up messages, and enabling iCloud Photo Library for backing up photos and videos.

Files (Apple)

Files
In iOS 11, iCloud Drive has been integrated into the new Files app, replacing the standalone iCloud Drive app.
Files allows users to browse local files stored within apps, as well as files stored in cloud storage services, including iCloud, Dropbox, Google Drive, and OneDrive.

IOS 5

5iOS 5.0iOS 5.1
iCloud account creation requires either an iOS device running iOS 5 or later or a Mac running OS X Lion v10.7.5 or later, as well as an internet connection and a compatible web browser.
The operating system also added iCloud, Apple's cloud storage service for synchronization of content and data across iCloud-enabled devices, and iMessage, Apple's instant messaging service.

Keynote (presentation software)

KeynoteApple Keynote.KEY extension - Keynote (Apple presentation software)
The three apps for both iOS and macOS that form Apple's iWork suite (Pages, Numbers, and Keynote), will be made available on a web interface (named as Pages for iCloud, Numbers for iCloud, and Keynote for iCloud respectively), and accessed via the iCloud website under each users iCloud Apple ID login.

Find My iPhone

In August 2014, it was rumored that hackers had discovered an exploit involving the Find My iPhone service, which potentially allowed an attacker to brute-force a user's Apple ID and access their iCloud data.
For the app to work, both the tracker device and the device being located must be supported devices with the Find My iPhone app installed and Location Services turned on, and both must be connected to the same iCloud account.

IPod Touch

iPod Touch (1st generation)iPod Touch (2nd generation)Apple iPod Touch
This feature allows users to store any kind of file, including photos, videos, documents, music, and other apps' data, in iCloud Drive and access it on any Mac, iPad, iPhone, iPod Touch, or Windows PC.
iOS 5 enables the user to do all this from the device and send it to the iCloud service, which supports macOS Lion and later.