The fifth major update for Apple's iOS mobile operating system that powers portable devices such as iPhones, iPads and iPod Touches. Apple iOS 5 debuted in October 2011 at the same time as the iPhone 4S and introduced powerful new features such as a built-in instant messaging client (iMessage), tabbed browsing in the Safari Web browser, a Notification Center for displaying a variety of alerts in one location, integrated support for Twitter, enhanced camera capabilities and the ability to wirelessly sync iOS devices to Macs or PCs over Wi-Fi connections.
iOS 5 also provides users with free access to Apple's iCloud, a suite of services that enables automatic synchronization across computers and iOS devices of e-mail mailboxes and messages, calendars, documents, photos, iTunes music and more.
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