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Chrome OS

Google Chrome OS is a Linux-based operating system designed by Google to work exclusively with web applications. Google announced the operating system on July 7, 2009. Chrome OS only ships on specific hardware from Google's manufacturing partners. The user interface takes a minimalist approach, resembling that of the Google Chrome web browser.

Chromium OS

Chromium OS is the open source development version of Google Chrome OS. Next difference is that Chromium OS can be compiled from the downloaded source code.

Chrome browser

Google Chrome is a freeware, cross-platform web browser that uses WebKit layout engine. At November 2012, according to StatCounter, Google Chrome had 35% worldwide usage share of web browsers making it the most widely used web browser.
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