C, and USB Type-B ports are used in all sorts of devices nowadays, but they're not all made the same, and some are becoming less common.
USB Type-A. USB Type-B. Mini-USB Type-A. Mini-USB Type-B. Micro-USB Type-A. Micro-USB Type-B. That special, ugly variant of micro-USB Type-B you need to use for phones (and some hard drives) with USB ...