Īs of December 2023, Apple's App Store contains more than 3.8 million iOS applications. It is the basis for three other operating systems made by Apple: iPadOS, tvOS, and watchOS. It is the world's second-most widely installed mobile operating system, after Android. It was also used on iPads (introduced: January 2010 availability: April 2010) until iPadOS was introduced in 2019, and on the iPod Touch devices, which were discontinued in mid-2022. It is the operating system that powers many of the company's mobile devices, including the iPhone.
It was unveiled in January 2007 for the first-generation iPhone, launched in June 2007.
IOS (formerly iPhone OS) is a mobile operating system developed by Apple Inc. Proprietary software except for open-source components