• Since 2011, Android has been the most popular smartphone and tablet operating system in the world. It has over three billion monthly active users as of May 2021, the largest installed base of any operating system, and the Google Play Store has over three million apps as of January 2021.
• Android's default user interface is mostly built on direct manipulation, with on-screen items being manipulated using touch inputs that closely approximate to real-world actions such as swiping, tapping, pinching, and reverse pinching, as well as a virtual keyboard. Bluetooth or USB support is available for game controllers and full-size physical keyboards.
• Android devices start with the home screen, which is similar to the desktop on personal computers in terms of navigation and information. App icons activate the corresponding app, whereas widgets display live, auto-updating content immediately on the home screen, such as a weather forecast, the user's email inbox, or a news ticker.

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