In computer hardware, a port serves as an interface between the computer and other computers or peripheral devices. Physically, a port is a specialized outlet on a piece of equipment to which a plug or cable connects. Electronically, the several conductors making up the outlet provide a signal transfer between devices.
Serial Port
send and receive one bit at a time via a single wire pair (Ground and +/-).
Parallel port
send multiple bits at the same time over several sets of wires.
USB Port
Can connect up to 127 different peripherals
FireWire Port
Previously known as IEEE 1394 port. Can connect up to 63 devices.
