3 places for connectors. Case front, mobo internal, mobo rear. So if the case is advertising. C, it's on the front. Might be faster for accessing photos etc when connecting new cellphones that use C instead of the older micro USB connection that required adapter/cable with a USB A connection. But mostly it's tech that's in place on pc's now, that's yet to catch up to most electronics because USB 2/3/micro is still so prevelent.