In 2007 Apple changed the game with the instructions of its smartphone and first ever mobile operating system. iOS was developed by Apple Inc, for iPhone, iPad and iPod Touch. The iOS updates were released through iTunes software and since iOS 5 it has been released over the air software updates. The iOS 5 which was released on June 2011 did not require a USB connection to iTunes to activate the iOS device.
iOS had undergone a vast number of upgrades and updates over the past eleven years of it’s existence. Some features that iOS has brought out are: iMessage, FaceTime, Apply Play, Siri and the Appstore. Synchronization of data can take place wirelessly or automatically through iCloud. Through Apple Worldwide Developers Conference (WWDC) new releases are broadcasted annually, sometimes with the release of a new model iPhone. There are up to 1.0-12.1 iOS versions released. iOS 12.1 being the most recent was released on October 30th 2018.

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iPhone OS 1
Released date: June 29, 2007
Latest Version & Release Date: 1.1.5, released July 15 2008
At the time this version launched it was not called iOS. One- three versions Apple referred to it as iPhone OS.
The multitouch screen, visual voicemail, and iTunes integration were indicative advancement. This iPhone OS lacked many features even though it was considered a great breakthrough that would be compared with the iPhones in the future, including the support for third-party apps. Apps that came with the OS included: mail, notes, camera, photos, calendar, safari, and iPod. iOS version 1.1 was the first version which was released to the public in September 2007, of the software compatible with the iPod touch.
New Features
• Safari browser
• Visual voicemail
• Music app
• Multitouch interface

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iPhone OS 2
Released date: July 11, 2008
Latest Version & Release Date: 2.2.1, released January 27 2009
The change introduced in this version was the App store and its support of third-party apps. A large number of enhancements were added. The changes introduced in 5 updates iPhone OS 2.0 included podcast support, public transit and walking directions in maps.
New Features:
• App store {500 apps were available}
• Improved maps app

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iPhone OS 3
Released date: June 17, 2009
Latest Version & Release Date: 3.3.2, released August 11, 2010
This update came with added features such as copy and paste, spotlight search, MMS support in the message app and the ability to record videos using the camera app. This would be the first version of the iOS to support iPad.
New Features:
• Spotlight search
• Recording videos
• Copy and paste

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iPhone OS 4
Released date: June 22, 2010
Latest Version & Release Date:4.3.5, released July 25, 2011
In this iOS, features that used often by users debuted in various updates including FaceTime, Multitasking, iBook, organising apps into folders, Personal Hotspot, AirPlay and AirPrint. iOS 4 was the name iOS itself. Older versions were named iPhone OS as mentioned above. It was not compatible with the original or first iPhone or the 1st generation iPod touch.
New Features:
• FaceTime
• Multitasking
• AirPlay
• AirPrint
• iBook
• Personal Hotspot

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iPhone OS 5
Released date: October 12, 2011
Latest Version & Release Date: 5.1.1, released May 7, 2012
In this iOS, Apple started following the trend wirelessness and cloud computing, by introducing new features and platforms. Some new features were:
• iCloud
• iMessage
• Notification Centre
• Wireless syncing and activation

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iPhone OS 6
Released date: September 19, 2012
Latest Version & Release Date: 6.1.6, released February 21, 2014
iOS 6 there was a lot of problems especially with Siri and being beaten by competitors. Hence Apple had to do essential changes.
New Features:
• Apple Maps
• Do Not Disturb
• Passbook

iPhone OS 7
iOS 7 was announced to Apple Worldwide Developers Conference (WWDC) on June 10 2013.
Released date: September 18, 2013
Latest Version & Release Date: 7.1.2, released June 30, 2014
Seeing that iPhone 4 and iPad 2 do not support Safari iOS 7 has limited support, because they couldn’t use all features of iOS 7. Users were dissatisfied due to the fact that things had changed. In iOS 7 a major overhaul of the user interface, designed to make it more modernised. Apple made improvements to iOS 7 and users become more accustomed to the changes and the complaints were diminished.
New Features:
• Activation Lock
• AirDrop
• CarPlay
• Control Centre
• Touch ID

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iPhone OS 8
This OS was announced on June 2, 2014 to the Apple WWDC.
Released date: September 17, 2014
Latest Version & Release Date: 8.4.1, released August 13, 2015
Dependable and unchanging operation. Through the changes of the last two versions now in the past, Apple once again focused on delivering new features that are significant to users. There was safe contactless payment system Apple Pay and with the iOS 8.4 update the Apple Music subscription service. There were sustained enhancements to the iCloud platform and addition of dropbox-like iCloud drive, library and music.
New features:
• iCloud
• Apple Music
• Handoff
• Apple Play
• Family Sharing
• Third-party Keyboards
• Home Kit

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iPhone OS 9
Released date: September 16, 2015
Latest Version & Release Date: 9.3.5, released August 25, 2016
The goal of iOS 9 was to set the foundation of the OS for the future the interface and technical foundation of the iOS after a few years of extensive changes was not reliable or stable and Apple had to focus on bringing back the reputation they once had and with iOS 9 they did just that.
New features:
• Night Shift
• Low Power Mode
• Public Beta Program

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iPhone OS 10
Released date: September 13, 2016
Latest Version & Release Date: 10.3.3, released July 19, 2017
iOS 10 had the ability to exchange and use information in a large diverse network and customisation. Apps could now communicate directly with each other on a device, which allowed one app to use some features from another without opening the second app. In new ways Siri became available to third-party in new ways. Built in apps were placed in iMessage.
New Features:
• iMessage
• Delete built-in apps

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iPhone OS 11
Released date: September 19, 2017
Latest Version & Release Date: 11.4, released May 29, 2018
This iOS was expanded for iPad, iTouch and even versions of iOS 11 could launched on the Apple watch and Apple TV, but it was originally created for the iPhone and the interest moved from the iPhone to the iPad. iOS 11 was strategized to replace laptops for some of its users through the use of the iPad Pro series model.
New Features:
• AirPlay
• Augmented Reality
• Major enhancements on iPad

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iPhone OS 11
Released date: September 17, 2018
Latest Version & Release Date:
iOS 12 updates were upgrades on most used features and adding on wrinkles that improve how people use their devices. The new features and enhancement that was added in iOS 12 are not as broad or revolutionized as some of the other updates to the OS.
New Features:
• Screen time
• Grouped notification
• Memoji (a kind of personalized Animoji)
• ARKit 2
• Siri improvements which includes Siri shortcuts

this is an example of an Animoji

https://www.lifewire.com/animoji-4153078