What is Port?

In computer and telecommunication devices, a port (noun) is generally a specific place for being
physically connected to some other device, usually with a socket and plug of some kind. Typically, a
personal computer is provided with one or more serial ports and usually one parallel port.
Types of Ports
Parallel Ports
An interface on a computer that supports transmission of multiple bits at the same time; almost
exclusively used for connecting a printer. On IBM or compatible computers, the parallel port uses a 25-pin connector. It is also known as a printer port or Centronics port. The IEEE 1284 standard defines the bi-directional version of the port.
Serial Port
It is a general-purpose personal computer communications port in which 1 bit of information is
transferred at a time. In the past, most digital cameras were connected to a computer’s serial port in order to transfer images to the computer. Recently, however, the serial port is being replaced by the much faster USB port on digital cameras as well as computers. Throughout most of the history of personal computers, data transfer through serial ports connected the computer to devices such as terminals and various peripherals.
SCSI Port
A port that’s faster than the serial and parallel ports but slower and harder to configure than the newer USB port. Also know as the Small Computer System Interface.
A high-speed connection that enables devices, such as hard-disk drives and network adapters, to be attached to a computer. Generally, two connectors, designated male and female, plug together to form a connection which allows two components, such as a computer and a disk drive, to communicate with each other. SCSI connectors can be electrical connectors or optical connectors.
USB Port
USB (Universal Serial Bus) is a plug-and-play hardware interface for peripherals such as the keyboard, mouse, joystick, scanner, printer and modem. USB has a maximum bandwidth of 12 Mbits/sec and up to 127 devices can be attached. With USB, a new device can be added to your computer without having to add an adapter card. It typicall is located at the back of the PC. USB was designed to allow many peripherals to be connected using a single standardized interface socket and to improve the plug-and-play capabilities by allowing hot swapping, that is, by allowing devices to be connected and disconnected without rebooting the computer or turning off the device.
Firewire
The IEEE 1394 interface is a serial bus interface standard for high-speed communications and isochronous real-time data transfer, frequently used in a personal computer (and digital audio and digital video). The interface is also known by the brand names of FireWire. FireWire is simply a really fast port that lets you connect computer peripherals and consumer electronics to your computer without the need to restart. It is a simple common plug-in serial connector on the back of your computer. It has the ability to chain devices together in a number of different ways without terminators for example, simply join 2 computers with a FireWire cable for instant high-speed networking.