Apple's mobile operating system for its iPhone, iPad, iPod touch, Apple TV and similar devices. Apple iOS was originally called the iPhone OS but was renamed in 2010 to reflect the operating system’s evolving support for additional Apple devices.
Apple iOS is currently in v9.x release, with iOS 9 first being unveiled in 2015 in conjunction with the release of the iPhone 6Sand iPhone 6S Plus smartphones.
Recent versions of iOS have introduced a number of powerful new features to the mobile OS, most notably Apple's Siri advanced voice recognition application, "Proactive," a contextual, predictive personal assistant that's tied in with Siri to deliver personalized information based on a user's preferences, habits and location, a built-in instant messaging client (iMessage), integrated support for Apple's iCloud personal cloud storage service, iTunes Radio, and AirDrop support.
Designed for use with Apple’s multi-touch devices, iOS supports input through direct manipulation. The system responds to various user gestures, such as pinching, tapping and swiping.