ChromiumOS is the operating system that Google ChromeOS is built on, which powers Chromebook laptops and ChromeOS workstations. The OS is all about the web. All apps are web apps and the entire experience takes place within the browser, so users do not have to deal with installing, managing, and updating programs. Each app is contained within a security sandbox and the OS verifies the integrity of its own code every time it is restarted, making it harder for malware and viruses to infect the computer. Most of all, ChromiumOS is obsessed with speed. It takes out every unnecessary process and runs everything it possibly can in parallel, allowing users to go from turning on the computer to surfing the web in a few seconds.
Many Googlers use Chromebooks and ChromeOS workstations as part of their daily work.
Fuchsia is a modern open source operating system that’s simple, secure, updatable, and performant. It provides core operating system functions like system resource management, a driver framework, and software abstractions. Fuchsia is a general purpose operating system designed to power a diverse ecosystem of hardware and software.
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.