What is "ios-7"

iOS 7 is the seventh version of the mobile operating system created by Apple, iOS, succeeding iOS 6, announced by the company at the Apple Worldwide Developers Conference (WWDC) on June 10, 2013 and released on September 18, 2013. It was the first complete redesign of iOS since its launch in 2007. The system includes a redesigned user interface and numerous feature changes. The design of new elements of iOS 7 was led by Jony Ive, Apple’s Senior Vice President of Design.