The official release of the Google Chrome browser only works on Windows. But since the browser code is open sourced, some folks have already created versions that work on the Mac and various flavors of Linux (Ubuntu, Red Hat, Debian, and more). Since it's not part of Google's browser, the name is Chromium. But the code is based entirely on the open sourced code base for Google's Chrome browser, so it's very close to the real Chrome browser.