An interface on a computer to which you can connect a device.

1.Serial Port

  •  Used in old Computers
  •  supports serial communication only
  •  transfers 1 bit of information in or out the port
  •  supports RS-232 standard
  •  Used to connect Printers, DialUp Modems,Old Digital Cameras, Serial  Mouse

2.Parallel Port

  •  Also known as Printer Port or Centronics Interface
  •  parallel communication physical interface
  •  Has 25 pins & supports transfer or receive 8 bits  of data
  •  Supports IEEE1284 standard
  •  Used to connect Printers, Scanners,CD Burners, Eternal HDD,Network   Adapters
  • EPP(Enhanced Parallel Port) or ECP (Extended Capabilities Port) are the new versions of parallel ports.

3.PS/2 Port

  • 6 pin Mini Din Connector
  • Developed by IBM
  • Bidirectional 8 Bit Port
  • This is called as Mouse Port/Keyboard Port as it can be used to connect Mouse & Keyboard.

4.USB (Universal Serial Bus)

  • USB Ports have replaced most of the previous interfaces including serial and parallel ports.
  • It allows data to be transferred between devices 
  • It is mainly used for connection, communication and power supply between computers and electronic devices.
  • A single USB supports upto 127 devices.
  • Supports Plug and Play installation and hot plugging.
  • USB Hub is a device which allows connection of multiple devices to the USB.
  • USB3.0 can transfer data upto 5GB/sec almost 10 times faster than USB2.0(480MBits).
  • Mouse,Keyboard,Printer,Scanner,Mobiles,Card Readers,Webcams,External HDD are the commonly used devices which can be connected to the system using USBs.

5.Infrared Port

  • Used to send and receive data using infrared light.
  • Uses irDA(infrared Data Association) protocol for data transfer.
  • irDA is a group of hardware manufacturers working together to create standards for infrared data transmission.
  • These are present in Laptops, Cell Phones and PDAs.
  • They are most commonly used in the Remote Controls of Televisions,DVDs etc.

6.Bluetooth Port

  • Short range radio frequencies are used for data transmission between devices.
  • It is mainly wireless interface and supports upto 10 meters for better usage.
  • Bluejacking is a process of sending data to unknown user using Bluetooth wireless technology.
  • Mobiles,Headsets,Mouse,Keyboard,Printer are few devices compatible with bluetooth technology.

7.S-Video Port

  • Also known as Separate Video port.
  • Generally connected using a cable with 4 pin mini DIN connectors.
  • Commonly found in DVD Players,computer video cards/graphic cards,projectors etc.

8.DVI Monitor Port

  • Known as Digital Visual Interface
  • Developed by Digital Display Working Group(DDWG) to replace VGA Connector standard.
  • DVI is designed to carry uncompressed digital video to display.
  • It is partially compatible with HDMI in Digital Mode 9DVI-D) and VGA in analog mode (DVI-A).
  • Mostly used in Desktop PCs and Monitors.
  • Many other devices support DVI indirectly through HDMI.

9.High Definition Multimedia Interface (HDMI)

  • It is the industry-supported,uncompressed, all-digital audio/video interface.
  • Complete digital Audio & video is delivered through a single cable.
  • HDMI implements the EIA/CEA-861 standards
  • HDMI carries almost 5Gbps bandwidth of data at a time.
  • HDMI supports standard video formats.
  • Also backward compatible with DVI.
  • HDMI 1.3 can transport Dolby Digital Plus, Dolby TrueHD, and DTS-HD Master Audio bitstreams in compressed form.
  • The HDMI Founders are Hitachi, Matsushita Electric Industrial (Panasonic/National/Quasar), Philips, Silicon Image, Sony, Thomson (RCA) and Toshiba.
  • HDMI ports can be found on

- DVD players and recorders
- Set top boxes, e.g. Sky Plus HD
- PCs and laptops
- Games consoles
- Camcorders
- Digital camcorder