i saw the URL of this site that should be italian (so it should be ".it") but it is " .cc " . why is this so?
From https://en.wikipedia.org/wiki/.cc:
Some open-source/open-hardware projects, such as the Arduino project, use a .cc for their home pages, since "CC" is the abbreviation for "Creative Commons", whose licenses are used in the projects.
I suspect it might also have had something to do with arduino.com being already taken.