What is Android? Android App Development Course

Android is a mobile operating system developed by Android Inc., which was founded by Andy Rubin, Rich Miner, Nick Sears, and Chris White in October 2003. It was later acquired by Google in 2005.

Android is built on a modified version of the Linux kernel and is designed primarily for touchscreen mobile devices like smartphones and tablets.

The android operating system's key features include a user-friendly interface, customizable home screens, a vast app ecosystem via the Google Play Store, and strong integration with Google services.

What is android app?

An Android app, short for "Android application," is a software program designed to run on devices that utilize the Android operating system. These devices primarily include smartphones, tablets, smart TVs, smartwatches, and other gadgets.

Android apps are developed using programming languages such as Java, Kotlin, and C++, and they offer various functionalities to users.

Android apps are central to the user experience on Android devices. They can provide a wide range of services, from communication and entertainment to productivity and utility. 
Here are some key points about Android apps:


Android apps are typically developed using Integrated Development Environments (IDEs) like Android Studio, which provide tools for coding, debugging, and testing. Developers use programming languages like Java or Kotlin to write the code that defines the app's behavior and functionality.

User Interface (UI): 

Android apps have user interfaces that allow users to interact with the app. This includes visual elements like buttons, text fields, images, and other interactive components. The UI design is crucial for creating a user-friendly experience.

App Components: 

Android apps are built using various components, including activities, services, content providers, and broadcast receivers. 
  1. Activities represent screens with a user interface, 
  2. Services perform background tasks, 
  3. Content providers manage data sharing, and 
  4. Broadcast receivers handle system-wide events.

Google Play Store: 

The primary distribution platform for Android apps is the Google Play Store. It's a digital marketplace where users can download and install apps. Developers can publish their apps on the Play Store, making them available to a vast audience.


Android apps need permission from users to access certain device features or data, such as the camera, microphone, location, or contacts. Permissions ensure user privacy and security by giving users control over what apps can do.


Developers can release updates to their apps to introduce new features, fix bugs, and improve performance. Users receive notifications about available updates through the Play Store.

App Monetization: 

Developers have various options to monetize their apps, including selling them outright, offering in-app purchases, showing ads, or providing a freemium model where basic features are free, but advanced features require payment.

Cross-Platform Development: 

While Android apps are primarily designed for Android devices, there are frameworks like Flutter and React Native that allow developers to create apps that can run on both Android and iOS devices with a single codebase.

App Lifecycle: 

Android apps have a lifecycle that includes stages such as creation, pause, resume, and termination. Understanding the app lifecycle is essential for managing resources efficiently and providing a smooth user experience.