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Android (operating system)

TLDR: Android is a mobile operating system that runs on smartphones and tablets. It was developed by a group of developers called the Open Handset Alliance, with Google being the main contributor. Android is based on the Linux kernel and is designed for touchscreen devices. It was first released in 2008 and has since become the most popular operating system for mobile devices.

Android is an open-source software, which means that its source code is freely available for anyone to use and modify. However, most devices come with a version of Android developed by Google, which includes additional proprietary software. Android devices come with preinstalled Google apps like Gmail, Google Maps, and YouTube.

The Android interface is based on direct manipulation, using touch inputs like swiping, tapping, and pinching to interact with the device. The home screen is the main hub where users can access their apps and widgets. The status bar at the top of the screen provides information about the device and its connectivity. Notifications appear on the screen to provide timely information and can be expanded for more details.

Android devices support a wide range of applications, which can be downloaded from the Google Play Store or other third-party app stores. These apps extend the functionality of the device and can be written using the Android software development kit (SDK) and programming languages like Kotlin and Java. Android devices also support external storage like SD cards, which can be used to expand the device's storage capacity.

Overall, Android is a versatile and customizable operating system that offers a wide range of features and applications for mobile devices.