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iOS 6 is the sixth major release of the iOS
mobile operating system A mobile operating system is an operating system for mobile phones, tablet computer, tablets, smartwatches, smartglasses, or other non-laptop personal computing, personal mobile computing devices. While computers such as typical laptops are "mobi ...
developed by
Apple Inc Apple Inc. is an American multinational technology company headquartered in Cupertino, California, United States. Apple is the largest technology company by revenue (totaling in 2021) and, as of June 2022, is the world's biggest company ...
, being the successor to iOS 5. It was announced at the company's
Worldwide Developers Conference The Worldwide Developers Conference (WWDC) is an information technology conference held annually by Apple Inc. The conference is usually held at Apple Park in California. The event is usually used to showcase new software and technologies in t ...
on June 11, 2012, and was released on September 19, 2012. It was succeeded by
iOS 7 iOS 7 is the seventh major release of the iOS mobile operating system developed by Apple Inc., being the successor to iOS 6. It was announced at the company's Worldwide Developers Conference on June 10, 2013, and was released on September 1 ...
on September 18, 2013. iOS 6 added a new
Apple Maps Apple Maps is a web mapping service developed by Apple Inc. The default map system of iOS, iPadOS, macOS, and watchOS, it provides directions and estimated times of arrival for driving, walking, cycling, and public transportation navigat ...
app, replacing
Google Maps Google Maps is a web mapping platform and consumer application offered by Google. It offers satellite imagery, aerial photography, street maps, 360° interactive panoramic views of streets (Street View), real-time traffic conditions, and rou ...
as the default mapping service for the operating system; a dedicated Podcasts app, as a central location for
podcast A podcast is a program made available in digital format for download over the Internet. For example, an episodic series of digital audio or video files that a user can download to a personal device to listen to at a time of their choosin ...
s; and a
Passbook A passbook or bankbook is a paper book used to record bank or building society transactions on a deposit account. Traditionally, a passbook was used for accounts with a low transaction volume, such as savings accounts. A bank teller or postma ...
app, for managing different types of tickets, boarding passes, coupons, and loyalty cards. The
App Store An App Store (or app marketplace) is a type of digital distribution platform for computer software called applications, often in a mobile context. Apps provide a specific set of functions which, by definition, do not include the running of the c ...
received a visual overhaul, bringing a card-based app layout as well as tweaks to search algorithms.
Facebook Facebook is an online social media and social networking service owned by American company Meta Platforms. Founded in 2004 by Mark Zuckerberg with fellow Harvard College students and roommates Eduardo Saverin, Andrew McCollum, Dust ...
was integrated into the operating system, incorporating status messages, like buttons, and contact and event synchronization to several of Apple's apps. New privacy controls allow users more fine-grained app permissions, as well as an option to prevent targeted advertising.
Siri Siri ( ) is a virtual assistant that is part of Apple Inc.'s iOS, iPadOS, watchOS, macOS, tvOS, and audioOS operating systems. It uses voice queries, gesture based control, focus-tracking and a natural-language user interface to answer qu ...
was added to more devices, and updated with more functionality, including the ability to make restaurant reservations, launch apps, retrieve movie reviews and sports statistics, and read items from the Notification Center. Reception of iOS 6 was positive. Critics noted that the operating system did not offer any significant speed improvements or major redesigned elements, but instead focused on refinements, with a general consensus that Apple "isn't overhauling things for the sake of it." iOS 6 didn't "completely change the way you use your device," but "each of the tweaks will make many daily smartphone actions easier across the board," and critics noted that refinement of "something that already works extremely well" is "something other companies would do well to emulate." The release of Apple Maps, however, attracted significant criticism, due to inaccurate or incomplete data. The issues prompted an open letter of apology from Apple CEO
Tim Cook Timothy Donald Cook (born November 1, 1960) is an American business executive who has been the chief executive officer of Apple Inc. since 2011. Cook previously served as the company's chief operating officer under its co-founder Steve Jobs ...
. Scott Forstall, who had supervised iOS development since its inception, announced his departure from the company shortly after the release of iOS 6.


History

iOS 6 was introduced at the
Apple Worldwide Developers Conference The Worldwide Developers Conference (WWDC) is an information technology conference held annually by Apple Inc. The conference is usually held at Apple Park in California. The event is usually used to showcase new software and technologies in t ...
on June 11, 2012.
iOS 6 was officially released on September 19, 2012.


Updates


System features


Siri

Apple's
Siri Siri ( ) is a virtual assistant that is part of Apple Inc.'s iOS, iPadOS, watchOS, macOS, tvOS, and audioOS operating systems. It uses voice queries, gesture based control, focus-tracking and a natural-language user interface to answer qu ...
intelligent personal assistant An intelligent virtual assistant (IVA) or intelligent personal assistant (IPA) is a software agent that can perform tasks or services for an individual based on commands or questions. The term "chatbot" is sometimes used to refer to virtual ...
, introduced in iOS 5 with the release of the
iPhone 4S The iPhone 4S (originally styled as iPhone 4 S, retroactively stylized with a lowercase 's' as iPhone 4s as of September 2013) is a smartphone that was designed and marketed by Apple Inc. It is the fifth generation of the iPhone, succ ...
, was updated to include the ability to make restaurant reservations, launch apps, read items from Notification Center, dictate
Facebook Facebook is an online social media and social networking service owned by American company Meta Platforms. Founded in 2004 by Mark Zuckerberg with fellow Harvard College students and roommates Eduardo Saverin, Andrew McCollum, Dust ...
and
Twitter Twitter is an online social media and social networking service owned and operated by American company Twitter, Inc., on which users post and interact with 280-character-long messages known as "tweets". Registered users can post, like, and ...
updates, retrieve movie reviews, detailed sports statistics, and more. Siri received language support for
Italian Italian(s) may refer to: * Anything of, from, or related to the people of Italy over the centuries ** Italians, an ethnic group or simply a citizen of the Italian Republic or Italian Kingdom ** Italian language, a Romance language *** Regional Ita ...
,
Korean Korean may refer to: People and culture * Koreans, ethnic group originating in the Korean Peninsula * Korean cuisine * Korean culture * Korean language **Korean alphabet, known as Hangul or Chosŏn'gŭl **Korean dialects and the Jeju language ** ...
, and
Cantonese Cantonese ( zh, t=廣東話, s=广东话, first=t, cy=Gwóngdūng wá) is a language within the Chinese (Sinitic) branch of the Sino-Tibetan languages originating from the city of Guangzhou (historically known as Canton) and its surrounding a ...
, and device support for
iPhone 5 The iPhone 5 is a smartphone that was designed and marketed by Apple Inc. It is the 6th generation iPhone, succeeding both the iPhone 4 and iPhone 4S, and preceding both the iPhone 5S and 5C. It was formally unveiled as part of a press ...
, fifth-generation iPod Touch, and third-generation iPad. In iOS 6.1, Siri was integrated with
Fandango Fandango is a lively partner dance originating from Portugal and Spain, usually in triple meter, traditionally accompanied by guitars, castanets, or hand-clapping. Fandango can both be sung and danced. Sung fandango is usually bipartite: it has ...
, allowing users to buy film tickets by voice. The feature was only available in the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...
at launch.


Facebook integration

Facebook Facebook is an online social media and social networking service owned by American company Meta Platforms. Founded in 2004 by Mark Zuckerberg with fellow Harvard College students and roommates Eduardo Saverin, Andrew McCollum, Dust ...
came integrated in several of Apple's native apps with iOS 6. Facebook features could be directly accessed from within native apps such as Calendar, which could synchronize Facebook events; Contacts, which could show Facebook friend information, and the
App Store An App Store (or app marketplace) is a type of digital distribution platform for computer software called applications, often in a mobile context. Apps provide a specific set of functions which, by definition, do not include the running of the c ...
and Game Center, which featured Facebook's
like button A like button, like option, or recommend button, is a feature in communication software such as social networking services, Internet forums, news websites and blogs where the user can express that they like, enjoy or support certain content. ...
; as well as through a widget in the Notification Center, which allowed users to post status updates to the social network.


Settings

The Settings app received multiple changes in iOS 6. The icon was revised to match the System Preferences icon used in the then-named
OS X macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and la ...
computer operating system developed by Apple; and a "Do Not Disturb" mode was added, which allows users to disable phone sounds. Additional options for Do Not Disturb mode include being able to allow phone calls from a specific group of contacts, and allowing sound on the second call if someone calls repeatedly. A crescent moon icon will appear in the status bar when Do Not Disturb mode is enabled. New privacy settings became available to users. In addition to "Location Services," the following menus were added in iOS 6: "Contacts," "Calendars," "Reminders," and "Photos." The updated privacy menus allow users more fine-grained privacy permission controls for each app, with new notifications when apps want access to information in each of the categories. iOS 6 also came with a "Limit ad tracking" user control setting to allow users the option to prevent
targeted advertising Targeted advertising is a form of advertising, including online advertising, that is directed towards an audience with certain traits, based on the product or person the advertiser is promoting. These traits can either be demographic with a focu ...
. Apple's "Advertising Identifier" was described by Apple as "a nonpermanent, nonpersonal, device identifier, that advertising networks will use to give you more control over advertisers' ability to use tracking methods. If you choose to limit ad tracking, advertising networks using the Advertising Identifier may no longer gather information to serve you targeted ads." In iOS 6.1, a "Reset Advertising Identifier" setting was added to allow users to reset the identifier used by advertising companies.


Other

iOS 6 added a Twitter widget in the Notification Center, where users could tweet without going into the app. This saved resources. The Share Sheet interface was updated to display a grid of icons, as opposed to a list, of different apps to which users could share content.


App features


Maps

A new
Apple Maps Apple Maps is a web mapping service developed by Apple Inc. The default map system of iOS, iPadOS, macOS, and watchOS, it provides directions and estimated times of arrival for driving, walking, cycling, and public transportation navigat ...
app replaced
Google Maps Google Maps is a web mapping platform and consumer application offered by Google. It offers satellite imagery, aerial photography, street maps, 360° interactive panoramic views of streets (Street View), real-time traffic conditions, and rou ...
as the default mapping app on the operating system. Apple Maps used Apple's vector-based engine, making for smoother zooming. New to Maps was
turn-by-turn navigation Turn-by-turn Navigation is a feature of some satellite navigation devices where directions for a selected route are continually presented to the user in the form of spoken or visual instructions. The system keeps the user up-to-date about the best ...
with spoken directions and 3D views in certain countries, "Flyover" views in some major cities, and real-time traffic. At launch, turn-by-turn navigation was only available for
iPhone 4S The iPhone 4S (originally styled as iPhone 4 S, retroactively stylized with a lowercase 's' as iPhone 4s as of September 2013) is a smartphone that was designed and marketed by Apple Inc. It is the fifth generation of the iPhone, succ ...
and later, and iPad 2 (cellular capability required) and later, while "Flyover" view was only available for iPhone 4S and later, fifth-generation iPod Touch, and iPad 2 and later.


Passbook

A new
Passbook A passbook or bankbook is a paper book used to record bank or building society transactions on a deposit account. Traditionally, a passbook was used for accounts with a low transaction volume, such as savings accounts. A bank teller or postma ...
app was added, to retrieve documents such as
boarding pass A boarding pass or boarding card is a document provided by an airline during airport check-in, giving a passenger permission to enter the restricted area of an airport (also known as the airside portion of the airport) and to board the airp ...
es, admission tickets, coupons and loyalty cards. An iOS device with Passbook can replace a physical card when scanned to process a
mobile payment A mobile payment, also referred to as mobile money, mobile money transfer and mobile wallet, is any of various payment processing services operated under financial regulations and performed from or via a mobile device, as the cardinal class of ...
at participating locations. The app has context-aware features such as notifications for relevant coupons when in the immediate vicinity of a given store, and automatic visibility of boarding passes when the user is at an airport, with notifications for gate changes.


Photos and Camera

The Camera app was updated to include a new Panorama mode that allowed users to take 240-degree panoramic photos. The Photos app received updates to the Photo Stream functionality, letting users remove images, as well as share custom Photo Streams with other people or the public.


App Store

The
App Store An App Store (or app marketplace) is a type of digital distribution platform for computer software called applications, often in a mobile context. Apps provide a specific set of functions which, by definition, do not include the running of the c ...
on iOS 6 had a brand new user interface that removed the "Categories" tab and replaced it with "Genius," Apple's search and recommendation engine. It also made use of cards rather than lists to present apps. There were also tweaks to the App Store's search algorithm, resulting in a "trend to favor newer companies," which sparked both developer concerns and praise. The App Store also updated apps without requiring the
iTunes iTunes () is a software program that acts as a media player, media library, mobile device management utility, and the client app for the iTunes Store. Developed by Apple Inc., it is used to purchase, play, download, and organize digital mu ...
password, and when installing or updating an app, users were no longer automatically returned to the home screen.


Phone

Upon receiving calls, iOS 6 enabled users to swipe up the lock screen to reveal "Reply with message" or "Remind me later." The "Reply with message" feature shows several pre-determined messages with an option for a custom message, while the "Remind me later" feature offers several options (such as an hour later, when the user gets home, or when the user leaves the current location) to enable a reminder.


Podcasts

Podcast functionality was separated from the iTunes app and received its own Podcasts app in iOS 6, in order to "centralize and promote podcast listening and downloading for users."


Safari

The Safari web browser was updated with a full-screen landscape view for iPhone and iPod Touch users. Reading List, a feature introduced in iOS 5, received offline support, in which text, images, and layout from saved articles get stored on the user's device.


FaceTime

FaceTime video calling was updated to work over a cellular connection, in addition to
Wi-Fi Wi-Fi () is a family of wireless network protocols, based on the IEEE 802.11 family of standards, which are commonly used for local area networking of devices and Internet access, allowing nearby digital devices to exchange data by radio waves ...
.


Clock

The
Clock A clock or a timepiece is a device used to measure and indicate time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month and ...
app, which had been on iPhone and iPod Touch since their original release, became available on
iPad The iPad is a brand of iOS and iPadOS-based tablet computers that are developed by Apple Inc., Apple Inc. The iPad was conceived before the related iPhone but the iPhone was developed and released first. Speculation about the development, ...
. The clock design looked similar to a Swiss railway clock, and Apple formed an agreement with the
Swiss Federal Railways Swiss Federal Railways (german: link=no, Schweizerische Bundesbahnen, ''SBB''; french: link=no, Chemins de fer fédéraux suisses, ''CFF''; it, Ferrovie federali svizzere, ''FFS'') is the national railway company of Switzerland. It is usuall ...
to license the design for its own use.


Music

The
Music Music is generally defined as the art of arranging sound to create some combination of form, harmony, melody, rhythm or otherwise expressive content. Exact definitions of music vary considerably around the world, though it is an aspe ...
app was redesigned for iPhone and iPod Touch users. The interface was now completely white, while the Now Playing UI was now equipped with motion sentitive scrubber bars similar to the iPod Nano 7th generation.


Removed functionality

The
YouTube YouTube is a global online video sharing and social media platform headquartered in San Bruno, California. It was launched on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim. It is owned by Google, and is the second mo ...
app, which had been a default app on iOS developed by Apple, was removed. Apple told ''
The Verge ''The Verge'' is an American technology news website operated by Vox Media, publishing news, feature stories, guidebooks, product reviews, consumer electronics news, and podcasts. The website launched on November 1, 2011, and uses Vox Media ...
'' that the reason for the removal was due to an expired license, but that YouTube users could still view videos through the Safari web browser. The company also confirmed that
Google Google LLC () is an American Multinational corporation, multinational technology company focusing on Search Engine, search engine technology, online advertising, cloud computing, software, computer software, quantum computing, e-commerce, ar ...
, which owns YouTube, was developing its own app, with a then-upcoming release through
App Store An App Store (or app marketplace) is a type of digital distribution platform for computer software called applications, often in a mobile context. Apps provide a specific set of functions which, by definition, do not include the running of the c ...
. The Apple-developed YouTube app remained on iOS 5 and previous iOS versions. In June 2017, former YouTube employee Hunter Walk
tweeted Twitter is an online social media and social networking service owned and operated by American company Twitter, Inc., on which users post and interact with 280-character-long messages known as "tweets". Registered users can post, like, and ...
that Apple contacted YouTube to make it a default app on the
original iPhone The iPhone (retrospectively referred to unofficially as the iPhone 2G, iPhone 1 or original iPhone) is the first iPhone model and the first smartphone designed and marketed by Apple Inc. After years of rumors and speculation, it was officia ...
to ensure mass market mobile launch for the video-sharing service, but required handling development efforts itself. In 2012, YouTube made the "gutsy move" to discontinue the license in an effort to "take back control of our app" by developing it themselves.


Reception

The reception of iOS 6 was positive. Dan Seifert of ''
The Verge ''The Verge'' is an American technology news website operated by Vox Media, publishing news, feature stories, guidebooks, product reviews, consumer electronics news, and podcasts. The website launched on November 1, 2011, and uses Vox Media ...
'' wrote that "iOS 6 looks nearly identical to iOS 5. There are a few subtle tweaks here and there. But for every small change to the look of iOS details, there are ten things that remain the same." While praising the
iPhone 4S The iPhone 4S (originally styled as iPhone 4 S, retroactively stylized with a lowercase 's' as iPhone 4s as of September 2013) is a smartphone that was designed and marketed by Apple Inc. It is the fifth generation of the iPhone, succ ...
for being a "snappy performer," he noted that "When it comes to speed, iOS 6 doesn't feel terribly different from iOS 5". Craig Grannell of ''
TechRadar ''TechRadar'' is an online publication owned by Future and focused on technology. It has editorial teams in the US, UK and Australia and provides news and reviews of tech products and gadgets. It was launched in 2007 and expanded to the US in ...
'' wrote that "iOS 6 is rather like the
iPhone 5 The iPhone 5 is a smartphone that was designed and marketed by Apple Inc. It is the 6th generation iPhone, succeeding both the iPhone 4 and iPhone 4S, and preceding both the iPhone 5S and 5C. It was formally unveiled as part of a press ...
or OS X Mountain Lion - the refinement of something that already works extremely well. Apple isn't overhauling things for the sake of it but, in the main, making the iOS experience gradually better. That in itself is something other companies would do well to emulate." Jason Parker of ''
CNET ''CNET'' (short for "Computer Network") is an American media website that publishes reviews, news, articles, blogs, podcasts, and videos on technology and consumer electronics globally. ''CNET'' originally produced content for radio and televi ...
'' wrote that "iOS 6 is a welcome upgrade for any iOS user, but it's not going to completely change the way you use your device. Instead, each of the tweaks here will make many daily smartphone actions easier across the board and offer some relief to those waiting for certain features (sending images from e-mail and call controls, for example)."


Problems


Maps app launch

In iOS 6, Apple replaced
Google Maps Google Maps is a web mapping platform and consumer application offered by Google. It offers satellite imagery, aerial photography, street maps, 360° interactive panoramic views of streets (Street View), real-time traffic conditions, and rou ...
with its own Apple Maps as the default mapping service for the operating system, and immediately faced criticism for inaccurate or incomplete data, including a museum in a river, missing towns, satellite images obscured by clouds, missing local places, and more. Apple CEO
Tim Cook Timothy Donald Cook (born November 1, 1960) is an American business executive who has been the chief executive officer of Apple Inc. since 2011. Cook previously served as the company's chief operating officer under its co-founder Steve Jobs ...
issued a letter on Apple's website apologizing for the "frustration caused by the Maps application," and recommended downloading alternative map apps from the App Store. Scott Forstall, the then-VP of iOS software engineering, was involuntarily dismissed from his role at Apple in October 2012 after he "refused to sign his name to a letter apologizing for shortcomings in Apple's new mapping service."


Advertising Identifier privacy skepticism

In September 2012, Sarah Downey, a "privacy expert" with the software company Abine expressed her concern that in spite of the new "Advertising Identifier," Apple didn't disclose details on what the identifier was actually based on. She stated: "I need them to tell me why it's not identifying because as we've seen from a lot other "non-identifying" pieces of data, they can identify you quite easily," and that "If you're using the opt-out, pplemay no longer gather information to serve you targeted ads. To me, that says they may still collect your information to do things other than serve you targeted ads, like build databases about you to send you marketing or to sell to third parties."


Abnormal data usage

Many users reported a higher-than-normal data usage after upgrading to iOS 6, causing some to be heavily billed for data largely exceeding their data plan. Steve Rosenbaum of ''
The Huffington Post ''HuffPost'' (formerly ''The Huffington Post'' until 2017 and sometimes abbreviated ''HuffPo'') is an American progressive news website, with localized and international editions. The site offers news, satire, blogs, and original content, and ...
'' wrote that "The bug is the result of an iOS 6 problem that connects the phone to the cellular data network whenever the phone is connected to a WiFi signal," and also stated that Apple had released a
patch Patch or Patches may refer to: Arts, entertainment and media * Patch Johnson, a fictional character from ''Days of Our Lives'' * Patch (''My Little Pony''), a toy * "Patches" (Dickey Lee song), 1962 * "Patches" (Chairmen of the Board song ...
.


FaceTime certificate expiration

In April 2014, users who were still running iOS 6 could not connect to FaceTime due to the expiration of a certificate. Apple released a support document explaining the problem, adding that devices capable of upgrading to
iOS 7 iOS 7 is the seventh major release of the iOS mobile operating system developed by Apple Inc., being the successor to iOS 6. It was announced at the company's Worldwide Developers Conference on June 10, 2013, and was released on September 1 ...
must do so to fix the issue, while devices stuck on iOS 6 would receive an iOS 6.1.6 update.


Supported devices

With this release, Apple dropped support for older devices, specifically the third-generation
iPod Touch The iPod Touch (stylized as iPod touch) is a discontinued line of iOS-based mobile devices designed and marketed by Apple Inc. with a touchscreen-controlled user interface. As with other iPod models, the iPod Touch can be used as a musi ...
and the first-generation iPad.


iPhone

*
iPhone 3GS The iPhone 3GS (originally styled iPhone 3G S) is a smartphone that was designed and marketed by Apple Inc. It is the third generation iPhone and the successor to the iPhone 3G. It was unveiled on June 8, 2009 at the WWDC 2009 which took pl ...
*
iPhone 4 The iPhone 4 is a smartphone that was designed and marketed by Apple Inc. It is the fourth generation of the iPhone lineup, succeeding the iPhone 3GS and preceding the 4S. Following a number of notable leaks, the iPhone 4 was first unvei ...
*
iPhone 4S The iPhone 4S (originally styled as iPhone 4 S, retroactively stylized with a lowercase 's' as iPhone 4s as of September 2013) is a smartphone that was designed and marketed by Apple Inc. It is the fifth generation of the iPhone, succ ...
*
iPhone 5 The iPhone 5 is a smartphone that was designed and marketed by Apple Inc. It is the 6th generation iPhone, succeeding both the iPhone 4 and iPhone 4S, and preceding both the iPhone 5S and 5C. It was formally unveiled as part of a press ...


iPod Touch

*
iPod Touch (4th generation) The fourth generation iPod Touch (marketed as "the new iPod touch", and colloquially known as the iPod Touch 4G, iPod Touch 4, or iPod 4) is a multi-touch mobile device designed and marketed by Apple Inc. with a touchscreen-based user interfac ...
*
iPod Touch (5th generation) The fifth generation iPod Touch (stylized and marketed as the iPod touch, and colloquially known as the iPod Touch 5G, iPod Touch 5, or iPod 5) was unveiled at Apple's media event alongside the iPhone 5 on September 12, 2012, and was released ...


iPad

* iPad 2 *
iPad (3rd generation) The iPad (3rd generation) (marketed as The new iPad, colloquially referred to as the iPad 3) is a tablet computer, developed and marketed by Apple Inc. The third device in the iPad line of tablets, it added a Retina Display, the new Apple A5X ...
*
iPad (4th generation) The iPad (4th generation) (marketed as iPad with Retina display, colloquially referred to as the iPad 4) is a tablet computer produced and marketed by Apple Inc. Compared to its predecessor, the third-generation iPad, the fourth-generati ...
*
iPad Mini (1st generation) The first-generation iPad Mini (stylized and marketed as iPad mini) (known retrospectively as the iPad Mini 1) is a mini tablet computer designed, developed, and marketed by Apple Inc. It was announced on October 23, 2012, as the fourth ma ...


References


External links

* {{Apple *6 2012 software Products introduced in 2012 Mobile operating systems Tablet operating systems Proprietary operating systems