Ethernet ports connect computers to networks via ethernet cables

IEEE 1394 port is a serial bus used for audio and video interface and is also widely used as a replacement for scsi interface.  It can be used for networking.  It is also widely used as a hard drive interface (also known as fiery)

Printer port or Centronics port was primarily used as a printer interface.  It is a parallel port.

PS/2 ports were primarily used for mouse and keyboard.

Serial port is primarily concerned with communication.  It uses the rs 232 standard.  It was used to connect modems to the pc.

USB Port is a serial port that connects so many different kinds of peripheral to the pc that I have lost count.

A Video Graphics Array (VGA) connector is a three-row 15-pin DE-15 connector. The 15-pin VGA connector is found on many video cards, computer monitors, and some high definition television sets. On laptop computers or other small devices, a mini-VGA port is sometimes used in place of the full-sized VGA connector.

The DVI standard has achieved widespread acceptance in the PC industry, both in desktop PCs and monitors. Most contemporary retail desktop PCs and LCD monitors feature a DVI interface

SCSI port is most commonly used for hard disks and tape drives, but it can connect a wide range of other devices, including scanners and CD drives.

A TRS connector (tip, ring, sleeve) is a common family of connector typically used for analog signals including audio.

HDMI (High-Definition Multimedia Interface) is a compact audio/video interface for transmitting encrypted uncompressed digital data.

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