What is Android Operating System (OS): Features, and How it Works?

Android OS, short for Android Operating System, is an open-source operating system based on the Linux kernel for mobile devices like smartphones, tablets, smartwatches, and other wearables.
From its humble beginnings when it was competing with Nokia’s Symbian OS, Windows Phone OS, and Blackberry OS to its current dominant position in the mobile operating system market, Android OS has changed the way we interact with technology.
This article will cover Android OS history, architecture, features, and why it matters. You will also learn about the OS versions, pros, and cons. So, let’s get started!

Table of Contents:

• What is Android OS?
• Key Features of Android OS
• Architecture of Android OS
• Other Commonly Used Architectures in Android
• Android OS Version History
• Advantages of Android Operating System
• Disadvantages of Android Operating System
• Android vs Other Mobile OS (iOS, HarmonyOS, etc.)
• Android vs iOS Statistics (2025 and beyond)
• Use Cases and Applications of Android OS
• Career Opportunities in Android

What is Android OS?

“Android OS, or Android Operating System, is a versatile, Linux-based operating system designed for touchscreen devices such as phones, tablets, and kiosks.”

Android was originally developed by Android Inc., which Google acquired in 2005, and it is now the most popular mobile OS in the world. It consists of the Linux kernel, native libraries, Android Runtime (ART), application framework, and user apps. Android is famous for its flexibility, huge app variety, and compatibility for all sorts of devices like phones, smart TVs, wearables, and even cars. Android apps are developed in Java or Kotlin, usually inside Android Studio. Android powers billions of devices and is the world’s most popular mobile platform thanks to its flexibility and the Google Play Store.

Key Features of Android OS

Android offers plenty of powerful features that benefit both users and developers:

1. Open-source foundation

Android is built on the Linux kernel, and its source code is available for everyone. Developers can look at it, change it, and improve it, which encourages creativity and cooperation.

2. Flexible and personalizable

You can swap out home screens, themes, icons, and widgets through the interface and manufacturer skins, and you can install third-party launchers or custom ROMs. This level of customization sets Android apart.

3. Runs multiple apps at once

On Android, you can have multiple apps open at once. You can easily switch back and forth between apps or run apps on the same screen for added productivity, or watch a movie in Picture-in-Picture mode while you do other things.

4. Large app ecosystem (Google Play Store)

The Play Store has millions of apps, games, books, music, and more. You can also install some apps via sideloading or third-party stores.

5. Google’s Voice Search

Google Assistant is already built into Android. You can ask it questions, have it set reminders, control smart home devices, and get assistance using only your voice.

6. Strong security measures

Android protects your device with the app sandbox, encryption, secure boot, regular security updates, Play Protect app scanning, and enforced app permissions.

7. Inclusive Features for All Users

Android includes features that make using the device simpler for those with disabilities screen readers, magnification gestures, color inversion, text-to-speech, and voice control, so devices are accessible to all.

8. Integrates easily with Google services

Android integrates well with Gmail, Google Maps, Google Drive, Google Photos, and other Google apps, so you can stay organized and in touch.

9. Tools for Developers

Developers receive Android Studio (the official IDE) and all the tools and documentation they need, like libraries, APIs, and sample code, to build, test, and validate successful apps.

Architecture of Android OS

Android architecture is a layered software stack made up of five main layers: Applications, Application Framework, Android Runtime, Platform Libraries, and the Linux Kernel. Android software companies an open-source Linux Kernel coupled with a set of various C/C++ libraries upon which application framework services are built. The Linux kernel does most of the tasks related to operating system functions on smartphones, and the Android Runtime (ART), which replaced the Dalvik Virtual Machine in Android 5.0, executes Android applications.

Let’s understand the layered architecture:

• Applications Layer (User-installed apps and system apps)
• Application Framework (Activity Manager, Package Manager, etc.)
• Android Runtime (ART) or Dalvik (used earlier)
• Libraries (SQLite, WebKit, SSL, etc.)
• Linux Kernel (hardware abstraction, drivers, etc.)

It is important for you to know the architecture of Android and not just be a user. If you want to learn and become a master of this structure with the Kotlin language, this Android Mastery with Kotlin: Beginner to Advanced course is just the right choice.

1. Applications Layer

Applications are the top tier of the Android architecture. The pre-installed system applications (home, contacts, camera, gallery, etc.) and third-party applications you download from the Play Store (chat apps, games, etc.) are installed here. They are executed inside the Android runtime, which uses the facilities provided by the application framework.

2. Application Framework

The application framework is the Android layer that gives developers the services and APIs they need to build applications. It provides access to device functionality such as hardware and the screen. It comes with several important services so you can create more powerful and more consistent Android applications without doing everything yourself. The services are as follows:

1. Activity Manager: Handles an application’s activities and their life cycle (opening a screen, pausing a screen, closing a screen, etc.).
2. Notification Manager: Provides apps the ability to display alerts or messages to the user.
3. Package Manager: Tracks all applications that the device has.
4. Window Manager: Responsible for placing windows on the screen and managing its appearance.
5. Content Providers: Aid apps that want to provide data to other apps (such as contacts or photos).
6. View System: How things (buttons, text, etc.) are displayed on the screen.

3. Application Runtime

The Android Runtime (ART) is the environment in which Android apps execute. It includes core libraries and a virtual machine. Primarily, it supplies the foundation upon which the application framework is built and provides the basic building blocks for our application using core libraries. DVM is a register-based virtual machine that has been adapted for Android and designed specially, to run multiple instances on a device, similar to the JVM. For threading and low-level memory management, it relies on the Linux kernel layer. With the help of core libraries, we can create an Android application using the standard JAVA or Kotlin programming language.

4. Platform Libraries

The platform libraries consist of different C/C++ libraries (core libraries) and Java libraries (Media, Graphics, Surface manager, OpenGL, etc.) that serve as Android development support.

1. Play and record audio and video in the media library.
2. A surface manager for controlling access to the display subsystem.
3. Both SGL and OpenGL are cross-platform, cross-language application program interfaces (APIs) for 2D and 3D computer graphics.
4. The database is supported by SQLite, and the font is supported by FreeType.
5. WebKit is the open-source web browser engine that enables the showing of web content and facilitates page loading.
6. SSL (Secure Sockets Layer), now succeeded by TLS, is a security technology for establishing an encrypted link between a web server and a browser.

5. Linux Kernel

In Android architecture, the Linux kernel is key to everything. It commands and controls all current drivers, like video drivers, camera drivers, Bluetooth drivers, audio drivers, memory drivers, and all operating at runtime. The kernel will act as the software abstraction layer between the device hardware and the Android stack. It manages memory, power, all the devices, etc. The characteristics of the Linux kernel are:

1. Secure: The Linux kernel provides security between the application and the system.
2. Memory Management: It takes care of memory management in an effective way so we are free to develop our apps.
3. Process Management: It does good process management and shifts resources to processes when they require it.
4. Network Stack: It has a good network stack on it.
5. Driver Model: It lets hardware vendors write drivers for the Linux build so applications work on their devices.

Other Commonly Used Architectures in Android

Some of the commonly practiced Android architectures are as below:

1. MVC ( Model View Controller )

MVC (Model-View-Controller) is an architecture pattern that separates an app into three components: Model stores the application data, View is the UI layer component that holds the elements that are visible to the end user, Controller performs the interaction between Model and View.

2. MVP (Model View Presenter)

The MVP (Model-View-Presenter) pattern improves maintainability, readability, scalability, and refactoring of the application. Here are the main highlights of how this model works:

• The presenter interacts with the model through the interface (or contract).
• Presenter and View have a one-to-one relationship—one presenter class will be responsible for managing one view at a time.
• Model and view are independent of each other.

3. MVVM (Model View ViewModel):

MVVM, or Model View ViewModel is similar to what the name suggests, like the MVC model, it also comprises three components: Model, View, and ViewModel. Following are some of the characteristics of the MVVM model:

ViewModel does not contain any sort of reference to the View.

• There are many-to-one relationships between View & ViewModel.
• No triggers to refresh the View.
• And we can do it in 2 ways:
  • Using RxJava for Data Binding.
  • Via Google’s DataBinding library.

Android OS Version History

Andy Rubin, Rich Miner, Nick Sears and Chris White founded Android Inc. in October 2003 in Palo Alto, California.

Nick Sears (then vice president of T-Mobile) and Chris White joined Rubin and Miner to develop and market the handset to carriers. They wanted to create more intelligent devices that would reshape how people use technology.

Google purchased Android Inc. in 2005 in July 2005 for a reported $50 million and began developing Android as a serious mobile platform.

Two years later, the Open Handset Alliance (OHA) was announced on November 5, 2007. The group consisted of 84 companies, including manufacturers such as HTC, Samsung, and Motorola; carriers like T-Mobile and Sprint-Nextel; chip makers such as Qualcomm and Texas Instruments; and Google. The main mission was to establish open standards and tools to support mobile devices, giving Android an edge in competing with iPhone.

Today, Android is the world’s most popular mobile OS. Originally, each version of Android had a dessert-themed name, like Cupcake, Donut, and Eclair, in alphabetical order. That tradition came to an end with Android 10, though members of the team still use dessert names internally.

Let’s see how many Android versions we have till now:

Advantages of Android Operating System

1. Open-source freedom

Android is built on the open-source Android Open Source Project (AOSP), which allows developers and companies to access, modify, and customize its code. This openness stimulates creativity and speeds up innovation.

2. Customize your experience

Do you want your phone to stand out? If yes, Android allows you to change your home screens, add widgets, switch themes, and even install a completely different launcher. Your phone reflects you.

3. Loads of device options

Android is the common thread in several popular and varied gadgets, everything from discounted midrange phones and wearables to the latest and greatest smartphone flagships. You choose what suits your style and your budget.

4. Massive app library

Google Play offers apps ranging from top-tier homework helpers and creative art apps to planet-exploring games. Tap your way to millions of apps.

5. Affordable for everyone

And since Android is free for manufacturers to use, those devices come with every possible price tag, including sub-$50. This is one reason decent smartphones are now affordable.

Disadvantages of Android Operating System

Some drawbacks of Android are as follows:

1. Android OS fragmentation

Android OS fragmentation generally involves the numerous devices with different Android OS versions and UIs that the platform supports. This may cause compatibility issues, disparate user experiences, and software update roll-out lags.

2. Bloatware from manufacturers

Some Android devices come with pre-installed manufacturer apps (bloatware) that often cannot be uninstalled. This can clog the user interface, slow things down, and eat up storage space.

3. Lack of software updates

Android devices, and specifically low and mid-range ones, may not get software upgrades on time. This, in turn, can limit access to new features and functions provided later in Android releases and potentially make devices vulnerable to security threats.

Android vs Other Mobile OS (iOS, HarmonyOS, etc.)

Here’s a comparison table for Android OS, iOS, and HarmonyOS:

Android vs iOS Statistics (2025 and beyond)

The global mobile application market size was valued at USD 252.89 billion in 2023 and is framed to reach USD 626.39 billion by 2030, with the support of a CAGR of 14.3% from 2025 to 2030. It covers the range of applications in multiple fields that include gaming, health & fitness, music & entertainment, social networking, retail, e-commerce, and others.

1. Global Market Share

Android holds about 71–72% of the global mobile OS market, compared with iOS’s 28–29%, largely because of its low-cost devices in developing regions such as Asia and Africa.

2. Revenue Comparison 

The App Store earns $85.1 billion (67% of the global app revenue), a distinct lead over Google Play’s $47.9 billion, due to the higher spending by iOS users.

3. User Base

Android’s user base is approximately 3.9–4.5 billion active users worldwide, versus 1.46–1.8 billion for iOS, reflecting the appeal of Android’s open-source model.

4. Popularity Influencing Factors

Android’s affordability keeps it in demand around the world, while iOS’s ecosystem and brand loyalty dominate premium markets such as the US (59.21% iPhone market share).

Mobile Operating System Market Share Worldwide – May 2025

Source: Image from Statcounter 

Use Cases and Applications of Android OS

Android OS is a Linux-based, open-source operating system that lets users interact with their devices, services, and apps. Its modular, highly customizable architecture lets device manufacturers and app developers tailor the user experience to specific devices and usage styles.

Android is flexible enough to run on many kinds of devices, each with different uses.

1. Smart TVs (Android TV)

Android also powers smart TVs, which allow you to stream content from different sources, use apps, browse the web, and control your TV experience using voice commands or a remote control.

2. Home

Android is also being used in home appliances such as refrigerators, washing machines, and ovens. The integration lets users monitor and manage smart features and settings, and receive real-time alerts for their connected appliances.

3. Healthcare devices 

Android runs on healthcare devices such as patient monitors, handheld clinical tablets, and medical data-capture terminals.

4. Wearables (Wear OS)

Wear OS smartwatches and fitness trackers can monitor users’ health measurements, share data in real time, and send data to mobile apps for analysis.

5. IoT (Internet of Things) devices

Smart thermostats, security cameras, connected lighting, or other IoT devices can run on Android-based software. Android also connects these devices to smartphones and tablets, so you can control and monitor them remotely.

6. Automotive (Android Auto) 

Google developed Android Auto, which projects phone apps onto a car’s infotainment display; a separate system, Android Automotive OS, runs directly on the vehicle. It allows drivers to use their car’s infotainment system to access navigation, music, messaging, and other apps while optimizing for driving and minimizing distractions.

7. Kiosks and digital signage

Android is used to power several products for retailers and other venues, such as kiosks, vending machines, cinema displays, in-store advertising, and more. Its support for content management, remote updates, and interactivity makes it well suited to these uses.

8. Industrial and professional uses of Android

Android is being used in growing numbers of industrial and professional applications, including inventory tracking, machinery control, field tracking and service, and logging of engine and meter readings. Tailored Android apps can be built to suit specific business needs.

9. Smartphones and tablets: 

Android powers smartphones and tablets, supporting functions such as communication, entertainment, navigation, productivity, and more.

Career Opportunities in Android

If you’re taking Android dev classes now and wonder what the job market has in store, we have good news: Android’s growth has increased demand for Android developers across many industries, not only traditional IT.

1. Industries:

Take a quick look at some important industries that you can explore exciting options in as an Android developer:

1.1. E-Commerce

E-commerce has grown quickly in recent decades, becoming now a destination of choice for consumers because of its convenience and selection. Today, most commerce — from groceries to gadgets — is done through mobile apps. This has resulted in a real demand for talented Android developers who can deliver seamless, user-friendly shopping apps. Taking an Android development course, such as one from Tops Technologies, can strengthen your foundation for a career in this growing industry.

1.2. Gaming

Now, mobile gaming is a big thing around the world, especially in India, and the opportunity is a very high-return. Growing at a fast pace, the gaming industry brings up tons of prospects for Android developers. If you are passionate about games and want to be part of this exciting industry, a dedicated Android development course is a sensible choice.

1.3. Education

The education industry has experienced a significant shift as digital learning platforms have become increasingly popular. They let students learn anytime and anywhere according to their pace of learning. With more education moving to mobile, there is an ever-increasing need for proficient Android developers. By joining a professional Android training course such as that of Tops Technologies, you can be part of this growing market very easily.

1.4. Banking

With the advent of online banking, especially post-COVID, mobile applications have become indispensable for financial management tools. Banks need to service customers with safe and easy-to-use Android apps that also prevent sensitive financial information from theft. This, of course, makes for great job prospects for developers with the right skills. Joining the Android training course at a reputed institute can help you get that theoretical knowledge and practical experience to be successful in this industry.

1.5. Information Technology (IT)

The IT industry employs a large share of Android developers. Businesses of all sizes require competent developers to create and maintain Android apps that meet a wide range of business requirements, including enterprise and customer-facing apps. IT companies also typically have client projects, which offer a broader set of app development experiences. You can aim to acquire proficient skills to get a good job at top IT companies by pursuing the Android development course from a renowned institute like Tops Technologies.

2. Android Developer Salaries in the US

The illustration shows the average income of an Android Developer in the US. Entry-level developers earn about $75K. In the medianis about $95K. Senior developers can top out at about $121K a year. The data was sourced from Glassdoor. 

3. Some Popular Roles and Responsibilities Include

This just goes to show that the Android environment has much to offer in the way of career prospects, from simple coding to design, testing, securing, and marketing as well. With more than 3 billion Android devices in circulation around the world, there is a great demand for adept developers. Here are a few main roles and tools you will need to be proficient in:

3.1. Android Developer

Role Overview: Developers for Android apps create and maintain software that is supported on Android devices. They build features, maintain app performance, and integrate APIs.

Key Skills & Tools:

• Languages: Kotlin (modern, official), Java (legacy support)
• IDE: The Android Studio (official IDE for Android)
• Libraries & Tools: Firebase (authentication, analytics, push notifications), Gradle (build automation)
• Career Tip: Today, learning Kotlin is no longer optional, as Google announced Kotlin as the preferred language for Android development in 2019.

3.2. Mobile UI/UX Designer

Role Overview: Designers working in this capacity would be responsible for designing logical, usable, and visually stunning interfaces for mobile devices. They ensure the app works well and is enjoyable to use.

Key Skills & Tools:

• The Toolbox: Figma, Adobe XD, Sketch
• Android Guidelines: Material Design (Google UI/UX standard)
• Collaboration: Tight feedback loop with developers to ensure responsive and accessible designs
• Career Tip: Get to know Material Design better to build interfaces that feel more native and fit in harmony with the Android platform.

3.3. QA – Automation Engineer 

Role Overview: QA engineers ensure the stability, functionality, and performance of Android apps by conducting manual tests and writing automated test scripts.

Key Skills & Tools:

• Framework for Testing: Espresso (UI), JUnit (unit testing)
• Tools: Android Studio, Firebase Test Lab, Appium (cross-platform testing)
• Automation: CI/CD automation with Gradle or Jenkins.
• Career Tip: Getting a grasp of instrumentation testing and integration with CI/CD pipelines gives extra value to the development team.

3.4. App Store Optimization (ASO) Specialist

Role Overview: App Store Optimization (ASO) specialists increase app visibility and downloads on the Google Play Store and other app stores. Like SEO, ASO involves optimizing metadata (title, keywords, description), screenshots, and reviews.

Key Skills & Tools:

• Tools: Google Play Console, App Annie, Sensor Tower
• Skills: SEO, keyword research, A/B testing, competitor analysis
• Focus Areas: In-app analytics, conversion rate optimization (CRO), performance analytics
• Career Tip: Knowing Firebase Analytics and app behavior is key for ASO people in aligning store performance with user engagement metrics.

3.5. Android Security Analyst

Role Overview: Android security analysts protect apps by identifying security flaws and implementing encryption and API security.

Key Skills & Tools:

• Security Tools: OWASP Mobile Security Testing Guide (MSTG), MobSF, Android Debug Bridge (ADB)
• Focus Areas: Secure coding, data encryption, permission control, authentication
• Tracking Tools: Firebase Crashlytics / Google Play Protect feedback
• Career Tip: Keeping up with current Android API-level security best practices and secure design patterns is crucial in this position.

Conclusion

As the world’s largest mobile OS by user numbers, Android runs on one of the most varied lineups of devices, from smart TVs to wearables. Its open-source model, large user base, and ample development resources, like Android Studio, Kotlin, Firebase, and Gradle, support the creation and implementation of new applications.

The Android operating system is flexible and well positioned for the future. Industries such as e-commerce, education, gaming, and finance are adopting emerging technologies and moving towards scalable, user-centric mobile applications. This, in turn, generates an ever-growing demand for Android developers, UI/UX designers, testers, security analysts, and ASO experts.

At Intellipaat, we help learners become job-ready and prepared for the roles they want. When you sign up for an Android App Development course with us, you’re not just learning to create apps; you’re also gaining access to one of the most sought-after professions in tech.

Android Operating System – FAQs