iOS is a mobile operating system developed and distributed by Apple Inc. It was launched to be the official operating system of the iPhone in 2007. Then, it was given the name OS X, of the same name of the software that ran on the Apple MacBook. But later it was called the iOs. Now it runs on iPhone, iPod Touch, iPad Mini and Apple TV. iOs is restricted to only Apple hardware and cannot be installed on any other device. As of August 2013, the Apple’s App Store contained more than 900,000 applications for iOS. These apps have been downloaded more than 50 billion times. In October 2013, iOS 7 was released which has the latest features compatible with iPhone 4 and newer phones only.
The user interface is based on the principle of direct manipulation. It uses multi-touch gestures including elements such as swipe, pinch, reverse pinch and tap. All these instructions have specific definitions in the context of the iOS operating system and its multi-touch interface. The shaking of the device has specific responses. It is used for giving the undo command or simply changing the screen from portrait to landscape mode. The iOS versions are regularly updated and released for downloads. The latest iOS versions are mostly released on iTunes from where it can be easily downloaded.
The home screen also known as the spring board displays the applications icons and also gives a dock at the bottom where they can pin their favourite icons or the most used ones. The screen has a status bar on top showing the battery power, service provider, signal strength and time. The home button can be used to return to the home page when we are in the middle of an application. For security, passcode can be set. Only after entering the right pass code at the lock screen can one access the home page.