Serial communication has been used by computers for many years, though not as widely used in today’s market. When most people refer to serial, they think of the DB9 cable. It is referred to as DB9 because it carries 9 pins within it. There is also DB25 in the serial family, though, which obviously carries 25 pins. DB9 was typically used for devices such as gamepads, mice, keyboards, or other such interface devices. The serial cables that we provide are solely for these devices, rather than for printers - all being DB9.