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Check out our complete guide to iOS 11 for all you need to know about the upgrade. This feature allows users to sync their music, pictures, videos, and more across all of their devices that have iCloud on them. Up to three apps can be cleared at a time compared to one in versions up to iOS 6. Gil Amelio Fred D. Which topic are you interested in?

What does iOS mean?

What is iOS and what does iOS stand for?

Each user is given 5 gigabytes of storage for free, but they are allowed to sync unlimited amounts of music, apps, books, and photos. A new feature called iMessage , built into the Messages app, allows anyone with an iOS device to send unlimited messages to people with iOS 5. The Reminders app allows users to make lists and alerts that can be based on a date or a location. The Newsstand app is not a real app, but it is a folder that shows the newspapers and magazines that the user is subscribed to.

In iOS 5, you can get to the camera quickly from the lock screen swiping up on the camera icon. Users can get to the camera without having to enter a passcode, but you can only use the camera. Notification Center was introduced in iOS 5, and it also changed how notifications are displayed. Instead of a message that appears in the middle of the screen, stopping what was going on at the time, they appear in a banner on the top of the screen.

The update included reliability improvements for high dynamic range photos, Safari bookmark synchronization fixes, and bug fixes. In previous iOS versions, notifications popped up on the screen as dialog boxes, interrupting the current activity.

In iOS 5, notifications are revamped, and show up as a temporary banner at the top of the screen. Recent notifications can also be accessed by pulling a " Notification Center " down from the top of the screen.

Users who prefer the old notification system can keep it by choosing the appropriate option in the Settings menu. The new service allows users to synchronize their music, pictures, videos, and application data across all of their iCloud-enabled devices.

Users are able to sign in to Twitter directly from the Settings menu. Photos can be "tweeted" directly from the Photos or Camera apps, and users are also able to tweet from the Safari , YouTube , and Google Maps apps.

Multitasking gestures debut on iPad with the release of iOS 5. Multitasking allows users to jump between apps without double-tapping the home button or first going to the home screen. The iPad keyboard could be undocked from the bottom of the screen, and could be split into two half-keyboards. The first iOS 5 release allowed the Camera app to be easily accessed from the lock screen for the first time.

Users double-clicked the home button, a camera icon would appear next to the "Slide to unlock" message, and users would click on it to directly access the camera. Pressing the volume-up button allows the user to take a picture.

In contrast to SMS , messages sent through iMessage use the Internet rather than regular cellular texting, but also in contrast to regular SMS, Android and BlackBerry devices are not compatible with the service.

Reminders allows users to create lists of tasks with alerts that can either be date-based or location-based. Newsstand does not act as a native app, but rather a special folder.

When selected, it shows icons for all of the periodicals that the user has subscribed to, such as newspapers and magazines. New issues are downloaded automatically. On iPhone, the iPod app was replaced by separate Music and Videos apps.

In iOS 5, Apple introduced Notification Center , which allows users to view a history of notifications. The user can tap a notification to open its corresponding app, or clear it. If a user taps a received notification, the application that sent the notification will be opened. Users can also choose to view notifications in modal alert windows by adjusting the application's notification settings.

Introduced with iOS 8, widgets are now accessible through the Notification Center, defined by 3rd parties. When an app sends a notification while closed, a red badge appears on its icon. This badge tells the user, at a glance, how many notifications that app has sent. Opening the app clears the badge. One major feature, VoiceOver , provides a voice reading information on the screen, including contextual buttons, icons, links and other user interface elements, and allows the user to navigate the operating system through gestures.

Any apps with default controls and developed with a UIKit framework gets VoiceOver functionality built in. Additional customization available for Made for iPhone products include battery tracking and adjustable sound settings for different environments. In , Liat Kornowski from The Atlantic wrote that "the iPhone has turned out to be one of the most revolutionary developments since the invention of Braille ", [78] and in , Steven Aquino of TechCrunch described Apple as "leading the way in assistive technology", with Sarah Herrlinger, Senior Manager for Global Accessibility Policy and Initiatives at Apple, stating that "We see accessibility as a basic human right.

Building into the core of our products supports a vision of an inclusive world where opportunity and access to information are barrier-free, empowering individuals with disabilities to achieve their goals". Implementation of multitasking in iOS has been criticized for its approach, which limits the work that applications in the background can perform to a limited function set and requires application developers to add explicit support for it.

Before iOS 4, multitasking was limited to a selection of the applications Apple included on the device. Users could, however "jailbreak" their device in order to unofficially multitask. In iOS 7, Apple introduced a new multitasking feature, providing all apps with the ability to perform background updates. This feature prefers to update the user's most frequently used apps and prefers to use WiFi networks over a cellular network, without markedly reducing the device's battery life.

A scrollable dock-like interface appears from the bottom, moving the contents of the screen up. Choosing an icon switches to an application. To the far left are icons which function as music controls, a rotation lock, and on iOS 4.

With the introduction of iOS 7, double clicking the home button also activates the application switcher. However, unlike previous versions it displays screenshots of open applications on top of the icon and horizontal scrolling allows for browsing through previous apps, and it is possible to close applications by dragging them up, similar to how WebOS handled multiple cards. With the introduction of iOS 9, the application switcher received a significant visual change; whilst still retaining the card metaphor introduced in iOS 7, the application icon is smaller, and appears above the screenshot which is now larger, due to the removal of "Recent and Favorite Contacts" , and each application "card" overlaps the other, forming a rolodex effect as the user scrolls.

Now, instead of the home screen appearing at the leftmost of the application switcher, it appears rightmost. In the iPad, the Control Center and app switcher are combined. The app switcher in the iPad can also be accessed by swiping up from the bottom. In the iPhone, the app switcher cannot be accessed if there are no apps in the RAM.

As of iOS 7, the process has become faster and easier. In iOS 7, instead of holding the icons to close them, they are closed by simply swiping them upwards off the screen. Up to three apps can be cleared at a time compared to one in versions up to iOS 6. Task completion allows apps to continue a certain task after the app has been suspended. The assistant uses voice queries and a natural language user interface to answer questions, make recommendations, and perform actions by delegating requests to a set of Internet services.

The software adapts to users' individual language usages, searches, and preferences, with continuing use. Returned results are individualized. Originally released as an app for iOS in February , [96] it was acquired by Apple two months later, [97] [98] [99] and then integrated into iPhone 4S at its release in October Siri supports a wide range of user commands, including performing phone actions, checking basic information, scheduling events and reminders, handling device settings, searching the Internet, navigating areas, finding information on entertainment, and is able to engage with iOS-integrated apps.

Game Center is an online multiplayer "social gaming network" [] released by Apple. A preview was released to registered Apple developers in August. However, Game Center is unofficially available on the iPhone 3G via a hack. In , iOS 7 was released with full bit support which includes native bit kernel, libraries, drivers as well as all built-in applications , [] after Apple announced that they were switching to bit ARMv8-A processors with the introduction of the Apple A7 chip.

While originally developing iPhone prior to its unveiling in , Apple's then- CEO Steve Jobs did not intend to let third-party developers build native apps for iOS, instead directing them to make web applications for the Safari web browser. The SDK is a free download for users of Mac personal computers. Sales of iPads in recent years are also behind Android, while, by web use a proxy for all use , iPads using iOS are still most popular.

By the middle of , there were million devices activated. During Apple's quarterly earnings call in January , the company announced that they had sold over one billion iOS devices since In the third quarter of , research from Strategy Analytics showed that iOS adoption of the worldwide smartphone market was at a record-low Android accounted for Since its initial release, iOS has been subject to a variety of different hacks centered around adding functionality not allowed by Apple.

Since the arrival of Apple's native iOS App Store, and—along with it—third-party applications, the general motives for jailbreaking have changed. An additional motivation is that it may enable the installation of pirated apps. On some devices, jailbreaking also makes it possible to install alternative operating systems, such as Android and the Linux kernel.

Primarily, users jailbreak their devices because of the limitations of iOS. Depending on the method used, the effects of jailbreaking may be permanent or temporary. The exemption allows jailbreaking of iPhones for the sole purpose of allowing legally obtained applications to be added to the iPhone. Initially most wireless carriers in the US did not allow iPhone owners to unlock it for use with other carriers. Modern versions of iOS and the iPhone fully support LTE across multiple carriers despite where the phone was originally purchased from.

The closed and proprietary nature of iOS has garnered criticism, particularly by digital rights advocates such as the Electronic Frontier Foundation , computer engineer and activist Brewster Kahle , Internet-law specialist Jonathan Zittrain , and the Free Software Foundation who protested the iPad's introductory event and have targeted the iPad with their " Defective by Design " campaign.

At issue are restrictions imposed by the design of iOS, namely digital rights management DRM intended to lock purchased media to Apple's platform, the development model requiring a yearly subscription to distribute apps developed for the iOS , the centralized approval process for apps, as well as Apple's general control and lockdown of the platform itself.

Particularly at issue is the ability for Apple to remotely disable or delete apps at will. Some in the tech community have expressed concern that the locked-down iOS represents a growing trend in Apple's approach to computing, particularly Apple's shift away from machines that hobbyists can "tinker with" and note the potential for such restrictions to stifle software innovation.

The original iPhone OS 1. Below are summaries of the most prominent features. This process is to ensure that no malicious or otherwise unauthorized software can be run on an iOS device. After the Low-Level Bootloader finishes its tasks, it runs the higher level bootloader, known as iBoot. If all goes well, iBoot will then proceed to load the iOS kernel as well as the rest of the operating system.

It has its own secure boot process to ensure that it is completely secure. A hardware random number generator is also included as a part of this coprocessor.

Each device's Secure Enclave has a unique ID that is given to it when it is made and cannot be changed. This identifier is used to create a temporary key that encrypts the memory in this portion of the system. The Secure Enclave also contains an anti-replay counter to prevent brute force attacks. Until recently, these were typically four numerical digits long. However, since unlocking the devices with a fingerprint by using Touch ID has become more widespread, six-digit passcodes are now the default on iOS with the option to switch back to four or use an alphanumeric passcode.

Touch ID is a fingerprint scanner that is embedded in the home button and can be used to unlock the device, make purchases, and log into applications among other functions.

When used, Touch ID only temporarily stores the fingerprint data in encrypted memory in the Secure Enclave, as described above.

There is no way for the device's main processor or any other part of the system to access the raw fingerprint data that is obtained from the Touch ID sensor. It involves placing data in randomly selected locations in memory in order to make it harder to predict ways to corrupt the system and create exploits. ASLR makes app bugs more likely to crash the app than to silently overwrite memory, regardless of whether the behavior is accidental or malicious. This allows some portions of the memory to be marked as non-executable, working alongside ASLR to prevent buffer overflow attacks including return-to-libc attacks.

As mentioned above, one use of encryption in iOS is in the memory of the Secure Enclave. When a passcode is utilized on an iOS device, the contents of the device are encrypted. This is done by using a hardware AES implementation that is very efficient because it is placed directly between the flash storage and RAM. The iOS keychain is a database of login information that can be shared across apps written by the same person or organization.

Third-party applications such as those distributed through the App Store must be code signed with an Apple-issued certificate. This continues the chain of trust all the way from the Secure Boot process as mentioned above to the actions of the applications installed on the device by users. Applications are also sandboxed , meaning that they can only modify the data within their individual home directory unless explicitly given permission to do otherwise.

For example, they cannot access data that is owned by other user-installed applications on the device. There is a very extensive set of privacy controls contained within iOS with options to control apps' ability to access a wide variety of permissions such as the camera, contacts, background app refresh, cellular data, and access to other data and services. Most of the code in iOS, including third-party applications, run as the "mobile" user which does not have root privileges.

This ensures that system files and other iOS system resources remain hidden and inaccessible to user-installed applications. However, developers are free to override this framework and utilize their own methods of communicating over networks. Two-factor authentication is an option in iOS to ensure that even if an unauthorized person knows an Apple ID and password combination, they cannot gain access to the account.

It works by requiring not only the Apple ID and password, but also a verification code that is sent to a device that is already known to be trusted. From Wikipedia, the free encyclopedia.

This article is about Apple's mobile operating system. For other uses, see IOS disambiguation. Original iOS logo, used until left and logo used —17 right. Usage share of operating systems. Address Space Layout Randomization. List of iOS devices. Information technology portal Apple portal. Retrieved September 17, Archived from the original on June 5,

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Apple provides major updates to the iOS operating system annually via iTunes and also, for iOS 5 and later, over-the-air. The latest version is iOS 11, released on September 19, It is available for iPhone 5S and later, iPad Air and later, iPad Pro, iPad Mini 2 and later, and sixth-generation iPod hawaiianlion.gq family: Unix-like, based on Darwin (BSD), macOS. iOS 11 A giant step for iPhone. A monumental leap for iPad. iOS 11 sets a new standard for what is already the world’s most advanced mobile operating system. It makes iPhone better than before. It makes iPad more capable than ever. And now it opens up both to amazing possibilities for augmented reality in games and apps. iOS 5 supports the same devices as iOS —the iPhone 3GS and iPhone 4, the iPad and iPad 2, and the third- and fourth-generation iPod touch. Yes, iPhone 3G owners—your hardware isn’t on that list.4/5.