iOS is Apple's mobile operating system, first released as iPhone OS in June 2007 alongside the original iPhone, and renamed to iOS starting with iOS 4 after the iPad's debut. In 2019, Apple introduced a separate iPadOS for iPads with iOS 13, though iOS remains the foundation for watchOS and tvOS. Apple releases a new major version annually, typically in September, with the latest being iOS 26 (released September 15, 2025). The initial iPhone OS 1 (announced January 2007) featured a touchscreen interface with multi-touch gestures and 16 built-in apps, but lacked support for native third-party apps, Adobe Flash, and copy-paste—drawing criticism from developers like John Carmack. Early updates like iOS 1.1.1 brought the iTunes Music Store to the iPhone, while the platform evolved to address early limitations and grow into the world's most popular mobile OS.