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What is ios

If you are new to the Application Development domain, you must familiarise yourself with iOS, the Operating System that runs on these devices. Learning What is ios how it works, and what it can do can allow you to make calls, send messages, browse the web, and play games.

iOS is also a platform that protects your data and identity, using various features and settings that ensure your security and privacy. Thus, it is crucial to learn everything about it. So, wait no more. Read this blog to learn What is iOS, its evolution, features, functionality, and security, and how to keep your iOS device updated.

Table of Contents

1) What is the meaning of iOS?

2) Evolution of Apple iOS versions

3) Key features of the iOS platform

4) Working of iOS

5) How to update iOS devices?

6) Security and privacy features in Apple's iOS

7) Conclusion

What is the meaning of iOS?

iOS is a software platform that runs on Apple’s digital devices, such as the iPhone, iPad, iPod touch, and Apple TV. iOS stands for iPhone Operating System, although it is not limited to the iPhone. iOS is based on the Mac OS X Operating System, which is derived from the Unix operating system.

iOS is a closed-source system, meaning that Apple does not publicly release the source code of iOS, and only Apple can modify it. However, iOS supports third-party applications, which are software programs that can be downloaded from the App Store and installed on iOS devices. This Operating System also supports various frameworks and libraries, which are collections of code that provide common functions and features for developers to use in their applications.

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Evolution of Apple iOS versions

Apple's iOS, the Operating System that empowers iPhones, iPads, and iPod Touch devices, has undergone a remarkable evolution since its inception. Launched in 2007 alongside the first iPhone, iOS 1.0 introduced a revolutionary touch-centric interface and essential features like the App Store. Subsequent versions refined the user experience and expanded functionality.

iOS 4, released in 2010, marked a significant shift with the introduction of multitasking, allowing users to run multiple apps simultaneously. iOS 7, in 2013, brought a visually striking redesign, flat icons, and enhanced multitasking capabilities. iOS 9, released in 2015, focused on performance improvements and introduced the proactive Siri assistant.

iOS 11, unveiled in 2017, introduced the Files app, augmented reality capabilities, and a redesigned App Store. Further, iOS 14, released in 2020, featured customisable widgets, App Library, and App Clips for quick app access. The latest version, iOS 15, launched in 2021, prioritises communication with FaceTime enhancements, introduces Focus modes for personalised notifications, and enhances privacy features.

Key features of the iOS platform

Now that you know What is iOS, let’s learn about its amazing features. This Operating System is known for its user-friendly, elegant, and consistent design, which makes it easy to use and navigate. Some of the key features of the iOS platform are:

Key features of the iOS platform

a) Multitasking: Introduced with iPhone 4 and 3GS, iOS enables seamless app switching through multitasking features and multi-finger gestures on iPads.

b) Social media integration: iOS facilitates easy content sharing and incorporates activity streams, seamlessly integrating social network interactions into apps.

c) iCloud: Apple's internet-based data storage service, iCloud, operates across all Apple devices and certain Windows platforms, ensuring secure data storage with encryption and offering backup options.

d) In-App purchases: Available on all Apple platforms, in-app purchases allow users to acquire additional digital items, subscriptions, and premium content directly within apps, with the App Store serving as a platform for promotion and sales.

e) Game centre: Apple's social gaming network, Game Center, enhances gaming experiences by providing features such as leaderboards, achievements, multiplayer capabilities, and a dashboard.

f) Notification centre: iOS consolidates app alerts in the Notification Center, allowing users to manage notifications at their convenience with customisable settings.

g) Accelerometer: Every iOS device incorporates a three-axis accelerometer, detecting changes in velocity along each axis and enhancing device functionality.

h) Gyroscope: iOS devices feature a three-axis gyroscope, measuring rotational data in each of the three axes, contributing to advanced functionality.

i) Assisted GPS - AGPS: The iPhone utilises an inbuilt AGPS chip for location detection. This provides a quick and accurate approximation of the user's location based on satellite information.

j) Accessibility: Apple products and services are designed with one-tap accessibility features. Thus, Apple ensures ease of use and alignment with users' preferences.

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Working of iOS

iOS is a layered system, meaning that it consists of several layers of software components that work together to provide the functionality and performance of the system. The layers of iOS are as follows:

a) Core OS: It is the lowest layer of iOS and provides the basic services and frameworks for the system, such as the kernel, drivers, security, encryption, networking, and power management.

b) Core services: This layer is above the Core OS and provides the essential services and frameworks for the system, such as the file system, databases, iCloud, Core Foundation, Core Location, Core Motion, and more.

c) Media: The Media layer provides the services and frameworks for the audio, video, graphics, and animation of the system, such as the Audio Toolbox, AV Foundation, Core Audio, Core Graphics, Core Image, Core Text, Core Video, and more.

d) Cocoa touch: It is the highest layer of iOS and provides the services and frameworks for the user interface and interaction of the system, such as the UIKit, Foundation, Event Kit, Game Kit, Map Kit, Message UI, and more.

How to update iOS devices?

Updating your iOS device is important to keep it secure, stable, and compatible with the latest apps and features. There are two ways to update your iOS device: over the air (OTA) or via iTunes. The two ways include the following:

OTA update

This is the easiest and most convenient way to update your iOS device, as it does not require a computer or a cable. To update your iOS device over the air, follow these steps:

a) Connect your device to a Wi-Fi network and a power source

b) Go to Settings > General > Software Update

c) Tap the Download and Install button

d) Follow the on-screen instructions

iTunes update

This is the alternative way to update your iOS device, which requires a computer, a cable, and the iTunes software. To update your iOS device via iTunes, follow these steps:

a) Connect your device to your computer using a USB cable

b) Launch iTunes

c) Select your device from the iTunes sidebar

d) Click the Check for Update option

e) Click the Download and Update option

f) Follow the on-screen instructions

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Security and privacy features in Apple's iOS

iOS is designed to be secure and private and to protect the user’s data and identity from unauthorised access and misuse. Some of the security and privacy features in iOS include the following:

Security and privacy features in Apple's iOS

a) Encryption: iOS encrypts the user’s data, such as photos, messages, contacts, and more, using a unique device key and a user passcode. This means that only the user can access their data, and no one else, not even Apple, can decrypt it.

b) Face ID and Touch ID: Face ID and Touch ID are secure and convenient ways to access the device and can also be used to authorise payments, sign in to apps, and more.

c) App Store: iOS ensures that the apps that are available on the App Store are safe and trustworthy. The applications undergo a rigorous review process by Apple before they are approved and published.

d) Privacy settings: iOS allows users to control and manage their privacy settings, such as location services, camera, microphone, contacts, and more, and to choose which apps can access them.

e) Sign in with Apple: iOS allows users to sign in to apps and websites using their Apple ID, without creating a new account or sharing their email address.

f) Safari: iOS allows users to browse the web safely and privately using the Safari browser, which has various features and settings, such as Intelligent Tracking Prevention, which blocks third-party trackers and cookies.


This blog has explored What is iOS and the evolution of iOS, highlighting its multitasking capabilities, cloud services, and various features that contribute to its popularity. It is evident that iOS stands as a testament to Apple's commitment to providing a seamless and user-friendly experience across its range of devices. Hope you enjoy reading the blog.

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Frequently Asked Questions

What makes iOS different from other Operating Systems? faq-arrow

iOS distinguishes itself with its seamless integration across Apple devices, providing a uniform user experience. Its closed ecosystem ensures optimal performance, security, and a consistent interface. The App Store, exclusive to iOS, offers a curated selection of apps, enhancing user safety and quality.

How does iOS contribute to accessibility? faq-arrow

iOS prioritises accessibility with features like VoiceOver, Magnifier, and AssistiveTouch. These tools empower users with diverse needs to navigate and interact effortlessly. Further, one-tap accessibility features are integrated across Apple products, promoting inclusivity. Apple's commitment to accessibility not only enhances user experience but also reflects a dedication to making technology accessible to everyone, regardless of abilities or disabilities.

What are the other resources and offers provided by The Knowledge Academy? faq-arrow

The Knowledge Academy takes global learning to new heights, offering over 30,000 online courses across 490+ locations in 220 countries. This expansive reach ensures accessibility and convenience for learners worldwide.

Alongside our diverse Online Course Catalogue, encompassing 17 major categories, we go the extra mile by providing a plethora of free educational Online Resources like News updates, Blogs, videos, webinars, and interview questions. Tailoring learning experiences further, professionals can maximise value with customisable Course Bundles of TKA.


What is Knowledge Pass, and how does it work? faq-arrow

The Knowledge Academy’s Knowledge Pass, a prepaid voucher, adds another layer of flexibility, allowing course bookings over a 12-month period. Join us on a journey where education knows no bounds.

What are related Web Development courses and blogs provided by The Knowledge Academy? faq-arrow

The Knowledge Academy offers various App and Development Courses including web development foundation, HTML Courses, and Website Design. These courses cater to different skill levels, providing comprehensive insights into Innovative Android Project Ideas.

Our Programming and DevOps blogs covers a range of topics related to Web Development, offering valuable resources, best practices, and industry insights. Whether you are a beginner or looking to advance your Programming skills, The Knowledge Academy's diverse courses and informative blogs have you covered.

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