The question has been closed for the following reason "Duplicate Question" by kevin Aug 16 '10 at 18:08
Chrome is an official well tested version of Chromium that Google releases.
answered Aug 16 '10 at 18:06
Chrome is the web browser and Chromium is the longer name of said browser. It is also the name of the web-based operation system (Chrome OS - for short)
answered Aug 16 '10 at 16:40