Ports are connectors used to connect external cables and devices to the motherboard. Motherboards that don't use integrated ports; they use headers on the motherboard instead. Headers are groups of pins used to connect devices or ports to the motherboard. A cable runs from the port and is plugged into the header on the board.
Listed here, are few communication ports:
Serial Ports: It is A male 9-pin or 25-pin port on a computer system used by slower I/O devices such as a mouse or modem. The name "serial" comes from the fact that a serial port "serializes" data.
Parallel Port: This header has 26 pins. A parallel port is used for simultaneous transmission of data, one byte at a time but over multiple wires i.e. one bit per wire. This port on the back of the computer normally connects printers and scanners.
