Hardware connections
If you don't know which plug for what goes where, look at this page.
Display / Video
| Name | looks like that | does this |
|---|---|---|
| VGA D-Sub |  | analog video input |
| HDMI |  | digital audio+video (sometimes network) |
| DVI |  | Digital Video Input |
| DVI-I | it's like DVI but with more bandwidth for higher resolutions | |
| DisplayPort (DP) |  | digital A/V |
see also: List of video connectors on Wikipedia
Network
| Name | looks like that | does this |
|---|---|---|
| Coax | connects you with the Cable network, sometimes Token Ring | |
| RJ45 8p8c | has 8 wires for gigabit ethernet |
Serial
| Name | looks like that | does this |
|---|---|---|
| USB 1 | connects mostly input devices |