Demystifying Display Connectors
 

VGA? Easy one. DVI, not too hard, HDMI, UDI, DisplayPort? All you need to know about these different connectors in this article:

"Most of my monitors are 19-inch CRT monsters. They do what I need them to do, they deliver a pretty image, but they're old. I still have a ViewSonic Optiquest V95 in service that dates back to around 1999. It's a VGA monitor, as are all of my displays. I shudder at the idea of updating them, not because of some sentimental attachment, but because connecting displays to computers has become so darned complicated.

http://www.extremetech.com/article2/...129TX1K0000532