A computer's audio ports link the computer's sound hardware with your speakers, microphone, headsets or other audio equipment. Every computer motherboard has at least a few basic audio ports built in, allowing you to connect stereo speakers and a microphone.
DVI (Digital Visual Interface) was developed by the industry body DDWG (the Data Display Working Group) to send digital information from a computer to a digital display, such as a flat-panel LCD monitor. HDMI took a step forward by integrating audio and video into a more compact interface.
DisplayPort connectors have 20 pins and are available in two sizes: DisplayPort and Mini DisplayPort (the latter is the port of choice for Microsoft’s Surface Pro tablet). Find one on Amazon. Interestingly, Intel’s Thunderbolt interface combines the features of Mini DisplayPort and adds PCI Express data connections—but that’s beyond the scope of this article.
Parallel ports were originally designed by IBM to connect printers to their IBM PC. They designed the port so that printers made by Centronics could be connected to it. IBM decided to use a 25 pin D-sub connector. This connector looks like a DB25 serial connector.
The TOSLINK port is distinct among all other ports and looks strikingly like a tiny little doggie door into the bowels of your device. Even more distinctive than shape is the fact that when the device is powered on, you can see a faint glow of red laser light around the port door.
These are found on some PC-video ports for some brands of 18-inch LCD monitors. Function. The analog RGB connector on an LCD screen is used to connect the monitor to a computer -- which is an RGB video input source. Likewise, the VGA port is an analog port connecting the the monitor to a computer.