what os do chromebooks use
A Chromebook is a laptop running Chrome OS as its operating system. The devices are designed to be used primarily while connected to the Internet, with most applications and data residing in the cloud . A Chromebook is an example of a thin client.
At a December 7, 2010, press briefing, Google announced the Chrome OS Pilot Program, a pilot study and the first Chromebook, the Cr-48 Chrome Notebook, a prototype, to test the Chrome OS operating system and modified hardware for it.