iOS - Wikipedia
https://en.wikipedia.org/wiki/IOS
iOS (formerly iPhone OS) is a mobile operating system created and developed by Apple Inc. exclusively for its hardware. It is the operating system that powers many of the company's mobile devices, including the iPhone and iPod Touch...
Download iOS Firmware for iPhone, iPad, iPod... / IPSW Downloads
https://ipsw.me/
Download current and previous versions of Apple's iOS, iPadOS, watchOS, tvOS and audioOS firmware and receive notifications when new firmwares are We do not (and never will) mirror these files. "Apple", "iOS", "iPadOS", "watchOS", "tvOS", "audioOS", "iPhone", "iPad", "Apple Watch", "iPod...
iOS | Apple Wiki | Fandom
https://apple.fandom.com/wiki/IOS
iOS (formerly iPhone OS) is a mobile operating system from Apple Inc. Originally developed for the iPhone, it has since been extended to support other Apple devices including the original Apple TV, iPod touch and iPad.
iOS - The iPhone Wiki
https://www.theiphonewiki.com/wiki/IOS
iOS, formerly known as iPhone OS (and just Mac OS X), is the operating system for the Apple TV, iPad, iPad mini, iPhone, iPod touch. iOS has four abstraction layers: the Core OS layer, the Core Services layer, the Media layer, and the Cocoa Touch layer.
Download iOS Firmware for iPhone, iPad, iPod, and Apple TV
https://iosindex.com/
Provides direct download link of current and previous version iOS firmware (.ipsw) for iPhone, iPad, iPad Mini, iPad Air, iPod Classic, iPod Touch, iPod Nano, iPod Shuffle, and Apple TV. Insert your iOS device model number below to identify your model and get the correct firmware.