Difference between 110V and 220V power outlet?
Get the right outlet, so the device-frying dunderhead isn't you!

The difference between a 110V (NEMA 1 or NEMA 5) and a 220V (NEMA 6) outlet is in the arrangement of the contacts.  Most 110V outlets can survive 220V across them (and are sometimes expected to in normal operation i.e. when the two outlets are on opposite legs of a multi-wire or "Edison" branch circuit), and certainly a 220V outlet will survive having a paltry 110V across it, but they are configured differently to keep dunderheads from plugging the wrong thing into the wrong outlet and having it fry due to the wrong voltage -- this was obviously a much bigger deal in the days before universal input power supplies, of course, but there is still plenty of stuff around that'd emit magic smoke if fed grossly wrong mains voltages.