After Android now lets talk about the another popular Operating System The  iOS.

The Full form of iOS  is iPhone Operating System. An Operating system which is only for iPhone and iPad provided by Apple Company.

An iOS is more secure than android . Because of its less sharing features and High Privacy.

All Versions of iOS :

1. 2007: iPhone OS 1

The first Apple smartphone operating system was not given a specific name until the following March, with the launch of the first Software Development Kit beta., when it became known as iPhone OS. The first iPhone could not support 3G, the copy and paste function, email attachments or MMS - and couldn't run third party apps.
Further updates included the introduction of the iTunes Music Store, allowing users to purchase music directly onto their phones (through a WiFi connection) for the first time, and the ability to create their own ringtones.

 

 

 

 

2. 2008: iPhone OS 2

 

Coinsiding with the launch of the iPhone 3G, the second major update to the operating system saw the launch of the App Store, leading to the introduction of third party apps and games. Full support for Microsoft Exchange and the option to wipe your phone in the event of failing to enter your passcode were other new features, the latter being added in a subsequent update.
Google Street View was enabled with the 2.2 update, featuring walking, driving and public transport options.

3. 2009: iPhone OS 3

Spotlight search enabled more comprehensive search through email, contacts, calendar, notes and within music, and the new voice memo function facilitated the recording and storing of audio notes. Purchasing within apps was also introduced, but only within paid-for apps.
With the third incarnation for the new 3GS handset, the cut, copy and paste function finally became commonplace, alongside the long-awaited push notifications for third party apps. Video recording, MMS (multimedia messaging service) and voice control were also added, and users were given the chance to purchase films, TV shows and audiobooks through iTunes.
The 3.2 version contained a raft of improvements designed for use with the newly released iPad. While not supporting general multitasking, it was made to accommodate the differing resolution of a larger screen than the iPhone, as well as revamping apps specifically for the new platform.

4. 2010: iOS 4

Introduced on June 21 2010, iOS 4 was the first operating system to bear the iOS name, released on the new flagship iPhone 4. Its folder system accommodated the storing of up to 12 similar apps within one mother folder, while multitasking allowed apps to run simultaneously, such as writing an email while listening to Spotify, and navigation apps continuing to track your location in the background.
iBooks, Apple's ebook-reading software, and its parent iBookstore was introduced, and the improved 5MP iPhone 4 camera was complemented by 'tap to focus' software and 5x digital zoom. The device's new front-facing camera also facilitated video calling feature FaceTime.

 

 

3. 2011: iOS 5

2011 saw the launch of the iPhone 4S and with it, iOS 5. The main new feature was Siri, Apple's voice-activated virtual assistant that had previously been downloadable from the App Store as a third party app. Now integrated into the OS, Siri now communicated with other apps to make calls, check emails and transcribe text.
Containing more than 200 new features, iOS 5 heralded the arrival of iOS user messaging system iMessage, Twitter integration across a range of apps and online storage facility iCloud, replacing previous system MobileMe.  

 

4. 2012: iOS 6

Tim Cook took to the stage at Apple's 2012 WorldWide Developers' Conference shocked fans by announcing that Google Maps would not feature in latest incarnation iOS 6, and would be replaced by the company's own inbuilt Maps app.
Siri also received a makeover, featuring restaurant recommendations, the ability to dictate tweets or Facebook statuses and film reviews.
A year after Twitter integration into Apple's native apps, Facebook was added to the fold, and Apple launched its answer to Google Wallet, Passbook, will collated tickets, boarding passes and coupons within the single app. 

 

 

 

 

5. 2013: iOS 7

iOS 7 marked a radical aesthetic departure for Apple, masterminded by Sir Jony Ive, and debuted on the twin release of the iPhones 5s and 5c. The new 'flattened' and pared-back user interface drew praise and criticism in equal measures.
The single-swipe control centre feature allowed users to quickly access key settings such as WiFi, Airplane mode, Bluetooth and the newly-introduced torch without having to delve into the Settings menu. Siri was upgraded to both male and female voices, and redesigned to understand French and German.
Other changes included a new camera interface with a square photo mode, full multitasking for all apps and new wallpapers. 

 

 

 

 6. 2014: iOS 8 

Announced at the 2014 WWDC conference, iOS 8,features frameworks HealthKit and HomeKit, integrating apps to track health data and the standardisation of controlling internet-enabled home appliances.
It shipped on the iPhone 6 and iPhone 6 Plus following their launch in September last year, and a beta version of iOS 8.4 is currently available to download.
Other features include being able to send audio and video messages by holding down a record button while inside the Messages app, new predictive typing feature QuickType and the new and improved file hosting service iCloud Drive. 

7. 2015: iOS 9

iOS 9 is now available, and with it, a whole host of new features. Better battery life thanks to the new Low Power Mode, Siri's new role as a deep-search assistant and a new keyboard and font are among the new updates, while older apps including Maps, Notes and Passbook have been given makeovers. Slide Over, Split View, and Picture in Picture are the three major new multitasking features for iPad, enabling you to use or watch multiple apps at the same time. 

 

8. Up coming iOS 10

Special Features of iOS 10 are -

1. Smarter Siri

2. Deeper 3D Touch integration

3. Custom Control Center

4. Improved Mail

5. Multi-user support

6. iPad widgets

7. NFC device pairing

8.Manual camera control options 

                                                                                                                  
                                                                                                                - By Speed up