iOS is a mobile operating system developed by Apple, originally for the iPhone and later extended to iPad and iPod, sharing roots with macOS. It features a multi-layer architecture for applications and media, and has undergone several major releases since its inception in 2007. While it offers advantages like connectivity and security, it also has drawbacks such as complicated unlocking methods and limited feature upgrades for devices like the iPod.

1. i Operating Systems
(iOS)

2. OUTLINE
 Introduction
 History
 Working Process
 Technologies
 Advantages
 Disadvantages
 Conclusion

3. INTRODUCTION
 iOS (formerly iPhone OS) is a mobile operating
system originally developed for the iPhone later
extended to ipad and ipod.
 iOS is derived from Mac OS X, with which it
shares the Darwinfoundation, and is therefore
a Unix-like operating system.
 Apple licenses the trademark for "iOS" from Cisco
Systems (who own IOS).

4. HISTORY
 The operating system was unveiled with the
iPhone at the Macworld Conference & Expo,
January 9, 2007, and released in June of that
year.
 On March 6, 2008, Apple released the first beta,
along with a new name for the operating system:
"iPhone OS”.
 In June 2010, Apple rebranded iPhone OS as
"iOS".
 Apple licensed the "IOS" trademark from Cisco.

5. Version History
 iOS 1.x: initial OS release
 iOS 2.x: second major OS release
 iOS 3.x: third major OS release
 iOS 4.x: fourth major OS release
 iOS 5.x: fifth major OS release

6. WORKING PROCESS
 iOS ARCHITECHTURE

7.  In iOS, there are four abstraction layers: the Core
OS layer, the Core Services layer, the Media layer,
and the Cocoa Touch layer.
 The current version of the operating system(iOS
5.0.1) uses roughly 770 megabytes of the device's
storage, varying for each model.

8. Cocoa Touch Layer
 The Cocoa Touch layer contains the key
frameworks for building iOS applications.
 This layer defines the basic application
infrastructure and support for key technologies
such as multitasking, touch-based input, push
notifications, and many high-level system
services.

9. Media Layer
 The Media layer contains the graphics, audio,
and video technologies geared towards creating
the best multimedia experience available on a
mobile device.

10. Core Services Layer
 The Core Services layer contains the
fundamental system services that all applications
use.
 iCloud Storage

11. Core OS Layer
 The Core OS layer contains the low-level features
that most other technologies are built upon.

12. TECHNOLOGIES
 iPhone
 iPad
 iPod
 Apple Tv

13. iPhone
 At the Macworld Conference & Expo in January
2007, Steve Jobs revealed the long
anticipated iPhone, a convergence of an Internetenabled smartphone and iPod.
 . The iPhone features a 3.5-inch (89 mm) touch
screen display, 4, 8, or 16 GB of
memory, Bluetooth, and Wi-Fi (both "b" and
"g"). The iPhone first became available on June
29, 2007 for $499 (4 GB) and $599 (8 GB) with
an AT&T contract.
 On October 4, 2011, Apple unveiled the iPhone
4S.

14. iPad
 On January 27, 2010, Apple introduced their
much-anticipated media tablet, the iPad running a
modified version of iOS.
 Offers multi-touch interaction with multimedia
formats including newspapers, magazines,
ebooks, textbooks, photos, movies, TV shows
videos, music, word processing documents,
spreadsheets, video games, and most existing
iPhone apps.
 On March 2, 2011, Apple introduced an updated
iPad model which had a faster processor and two
cameras on the front and back respectively.

15. iPod
 On October 23, 2001, Apple introduced
the iPod digital music player.
 The iPod is the market leader in portable music
players by a significant margin, with more than
220 million units shipped as of September 2009.
 iPod Shuffle
 iPod Nano
 iPod Classic

16. Apple Tv
 Apple TV is a digital media receiver developed
and sold by Apple.
 Apple offered a preview of the device in
September 2006 and began shipping it the
following March.It initially shipped with a
40 GB hard disk; a 160 GB version was
introduced two months later and the earlier model
was ultimately discontinued.
 Apple TV allows consumers to use an HDTV set
to view photos, play music and watch video that
originates from limited Internet services or a local
network.

17. ADVANTAGES
 Connectivity
 Reliability
 Scalability
 Security

18. DISADVANTAGES
 Semi-thread message
 There is no real features upgrade for iPod
 Unlock way is complicated
 Mail does not support the attachment directly

19. CONCLUSION
 Thus, iOS is Apple's mobile operating system
developed originally for the iPhone later extended
to iPad and iPod as well.
 Apple licenses the trademark for "iOS" from Cisco
Systems (who own IOS), the same company with
which Apple had earlier settled a dispute over the
"iPhone" trademark.
 iOS 4 is the first version of the OS to be a free
upgrade on the iPod touch; Apple had charged
$9.99 for earlier upgrades.