IOS

iOS is a series of mobile operating systems developed by Apple for their mobile device platforms (iPhone, iPad, and iPod Touch). It was formerly called iPhone OS and introduced alongside the 1st generation iPhone. The name stayed until the release of the iPad in early 2010 when Apple rebranded it to iOS. In 2019, Apple began to use the iPadOS moniker to brand the version of the operating system used on iPad devices.
iOS is based on the codebase of macOS, formerly OS X, and shares the same kernel, filesystem, and binary formats. The userland of iOS is like that of macOS, but with a mobile-friendly design that is touchscreen and content-centric. It lacks direct access to the filesystem and is unable to run arbitrary code by default. The only distribution method for software officially allowed on iOS is the built-in App Store. 
The userland consists of a home screen (known as SpringBoard internally) that manages the user's applications. Many applications from macOS exist in iOS and vice-versa.
Since the release of iOS 11 in 2017, iOS has only been compiled for 64-bit ARM-based processors. Since the release of iOS 16 in 2022, iOS has only been compiled for iPhone models.
No official emulator that can run the retail version of iOS exists. However, Apple provides the iOS Simulator with Xcode, which runs a modified build of iOS with output in a dedicated window. Unofficial emulators like Corellium and QEMU-T8030 can emulate iOS to an extent. There is also an open source fork of QEMUhttps://github.com/devos50/qemu that can emulate a 1st generation iPod Touch on iPhone OS 1.1, and a 2nd generation iPod Touch on iPhone OS 2. There is also an open source high level emulator named touchHLE that can run iPhone OS 2-3.0 games.
==Timeline ==
Name 	Darwin version	Codename 	Release date 	Notes
iPhone OS 1	9.0 	Alpine (iPhone OS 1.0)SUHeavenlyJuly (iPhone OS 1.0.1 - 1.0.2)Snowbird (iPhone OS 1.1 - 1.1.1)Oktoberfest (iPhone OS 1.1.2)Little Bear (iPhone OS 1.1.3 - 1.1.5) 	June 2007 	First version of iOS
iPhone OS 2	9.3.1 	Big Bear (iPhone OS 2.0 - 2.0.2)Sugar Bowl (iPhone OS 2.1 - 2.1.1)Timberline (iPhone OS 2.2)SUTimberline (2.2.1) 	July 2008 	First version of iOS to include App Store
iPhone OS 3	10.0 	Kirkwood (iPhone OS 3.0 - 3.0.1)Northstar (iPhone OS 3.1 - 3.1.2)SUNorthstarTwo (iPhone OS 3.1.3)Wildcat (iPhone OS 3.2 - 3.2.2) 	June 2009 	First version of iOS to work on the iPad
iOS 4 	10.3.1 	Apex (iOS 4.0 - 4.0.2)Baker (iOS 4.1 - 4.1.1)Jasper (iOS 4.2 - 4.2.4)Phoenix (iOS 4.2.5 - 4.2.10)Durango (iOS 4.3 - 4.3.5) 	June 2010 	
iOS 5 	11 	Telluride (iOS 5.0 - 5.0.1)Hoodoo (iOS 5.1 - 5.1.1) 	October 2011 	
iOS 6 	13 	Sundance (iOS 6.0 - 6.0.2)Brighton (iOS 6.1 - 6.1.6) 	September 2012	Final version of iOS to include the skeuomorphic UI
iOS 7 	14 	Innsbruck (iOS 7.0 - 7.0.6)Sochi (iOS 7.1 - 7.1.2) 	September 2013	First version of iOS to bring 64-bit ARM support
iOS 8 	14 	Okemo (iOS 8.0 - 8.0.2)OkemoTaos (iOS 8.1 - 8.1.3)OkemoZurs (iOS 8.2 - 8.2.1)Stowe (iOS 8.3)Copper (iOS 8.4 - 8.4.1) 	September 2014	
iOS 9 	15 	Monarch (iOS 9.0 - 9.0.2)Boulder (iOS 9.1 - 9.1.1)Castlerock (iOS 9.2 - 9.2.2)Eagle (iOS 9.3 - 9.3.1)Frisco (iOS 9.3.2)Genoa (iOS 9.3.3 - 9.3.6) 	September 2015	
iOS 10 	16 	Whitetail (iOS 10.0 - 10.0.3)Butler (iOS 10.1 - 10.1.1)Corry (iOS 10.2 - 10.2.1)Erie (iOS 10.3 - 10.3.1)Franklin (iOS 10.3.2)Greensburg (iOS 10.3.3 - 10.3.4) 	September 2016	Final version of iOS with 32-bit ARM support
iOS 11 	17 	Tigris (iOS 11.0 - 11.0.2)Bursa (iOS 11.1 - 11.1.2)Cinar (iOS 11.2 - 11.2.2)Dalaman (iOS 11.2.5 - 11.2.6)Emet (iOS 11.3 - 11.3.1)Fatsa (iOS 11.4)Gebze (iOS 11.4.1)	September 2017	
iOS 12 	18 	Peace (iOS 12.0 - 12.5.7) 	September 2018	
iOS 13 	19 	Yukon (iOS 13.0 - 13.7) 	September 2019	First version to use the iPadOS moniker on iPad devices
iOS 14 	20 	Azul (iOS 14.0 - 14.8.1) 	September 2020	
iOS 15 	21 	Sky (iOS 15.0 - 15.8.3) 	September 2021	Final version of iOS to support the iPod touch platform
iOS 16 	22 	Sydney (iOS 16.0 - 16.7.10) 	September 2022	
iOS 17 	23 	Dawn (iOS 17.0 - 17.7.5) 	September 2023	
iOS 18 	24 	Crystal (iOS 18.0 - 18.3.1) 	September 2024	
==References==
Category:IOS
Category:Operating systems