Google announced Chrome OS on July 7, 2009, describing it as an operating system in which both applications and user data reside in the cloud. To ascertain marketing requirements, the company relied on informal metrics, including

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Laptops running Chrome OS are known collectively as "Chromebooks". The first was the CR-48, a reference hardware designthat Google gave to testers and reviewers beginning in

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The software and updates are limited in their support lifetime. Each device model manufactured to run Chrome OS has a different end-of-life date, with all new devices released in 2020

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Initially, Chrome OS was almost a pure web thin client operating system that relied primarily on servers to host web applications and related data storage. Google gradually began encouraging developers to create "packaged applications", and later,

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Early in the project, Google provided publicly many details of Chrome OS's design goals and direction, although the company has not followed up with a technical description of the completed operating system.
User interface

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At its debut, Chrome OS was viewed as a competitor to Microsoft, both directly to Microsoft Windows and indirectly the company's word processing and spreadsheetapplications—the

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Chrome OS is built on top of the Linux kernel. Originally based on Ubuntu, its base was changed to Gentoo Linux in February 2010. For Project Crostini, as of Chrome OS 80,

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