iPhone OS ( IPhone Operating System).
iOS is an operating system used for mobile devices manufactured by Apple Inc. iOS used to run the iPad, iPhone and Touch Devices. iOS formerly iPhone OS.
“i” in the beginning of many of products. Other products are the iPad, iPhone, iPod, iMac. iOS is an operating system that runs on Apple’s mobile devices: iPad, iPhone, iPod. The main software that allows to interact with Apple phone or tablet. iOS utilizes a multi-touch interface.
More than one million iOS applications available for download in the app store, the most popular app store of any mobile device. iOS different from most other operating systems because they put each app in its own protective shell.