An operating system for a wide range of devices
Android is an operating system and software stack created for an array of devices with different form factors, including phones, tablets, wearables, TVs, automobiles, and connected devices. The primary purposes of Android are to create an open platform available for carriers, OEMs, and developers to make their ideas a reality and to provide a successful, real-world product that improves the mobile experience for users.
How Google uses Android
Android powers the Google Pixel and is used by many Googlers to quickly bootstrap mobile and hardware projects.